# Source code for xapian

    # This file was automatically generated by SWIG (https://www.swig.org).
    # Version 4.3.0
    #
    # Do not make changes to this file unless you know what you are doing - modify
    # the SWIG interface file instead.

    """
    Xapian is a highly adaptable toolkit which allows developers to easily
    add advanced indexing and search facilities to their own applications.
    It has built-in support for several families of weighting models
    and also supports a rich set of boolean query operators.

    In addition to the doc strings provided by this python library, you
    may wish to look at the library's overall documentation, either
    installed along with the bindings or online at
    <https://xapian.org/docs/bindings/python/>, as well as the library's
    documentation, possibly installed with the library or with its
    development files, or again online at <https://xapian.org/docs/>.
    """

    from sys import version_info as _swig_python_version_info
    from . import _xapian

    _swig_new_instance_method = _xapian.SWIG_PyInstanceMethod_New
    _swig_new_static_method = _xapian.SWIG_PyStaticMethod_New

    def _swig_repr(self):
        strthis = ""
        if hasattr(self.this, '__repr__'):
            strthis = "proxy of " + self.this.__repr__()

        return "<%s.%s; %s >" % (self.__class__.__module__, self.__class__.__name__, strthis,)

    import weakref

    __version__ = '2.0.0'

    class SwigPyIterator(object):
        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined - class is abstract")
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_SwigPyIterator
        value = _swig_new_instance_method(_xapian.SwigPyIterator_value)
        incr = _swig_new_instance_method(_xapian.SwigPyIterator_incr)
        decr = _swig_new_instance_method(_xapian.SwigPyIterator_decr)
        distance = _swig_new_instance_method(_xapian.SwigPyIterator_distance)
        equal = _swig_new_instance_method(_xapian.SwigPyIterator_equal)
        copy = _swig_new_instance_method(_xapian.SwigPyIterator_copy)
        next = _swig_new_instance_method(_xapian.SwigPyIterator_next)
        __next__ = _swig_new_instance_method(_xapian.SwigPyIterator___next__)
        previous = _swig_new_instance_method(_xapian.SwigPyIterator_previous)
        advance = _swig_new_instance_method(_xapian.SwigPyIterator_advance)
        __eq__ = _swig_new_instance_method(_xapian.SwigPyIterator___eq__)
        __ne__ = _swig_new_instance_method(_xapian.SwigPyIterator___ne__)
        __iadd__ = _swig_new_instance_method(_xapian.SwigPyIterator___iadd__)
        __isub__ = _swig_new_instance_method(_xapian.SwigPyIterator___isub__)
        __add__ = _swig_new_instance_method(_xapian.SwigPyIterator___add__)
        __sub__ = _swig_new_instance_method(_xapian.SwigPyIterator___sub__)
        def __iter__(self):
            return self

    # Register SwigPyIterator in _xapian:
    _xapian.SwigPyIterator_swigregister(SwigPyIterator)

    class Error(Exception):
        r"""

        All exceptions thrown by Xapian are subclasses of Xapian::Error.

        This class can not be instantiated directly - instead a subclass
        should be used.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined")
        __repr__ = _swig_repr
        get_type = _swig_new_instance_method(_xapian.Error_get_type)
        get_msg = _swig_new_instance_method(_xapian.Error_get_msg)
        get_context = _swig_new_instance_method(_xapian.Error_get_context)
        get_error_string = _swig_new_instance_method(_xapian.Error_get_error_string)
        __str__ = _swig_new_instance_method(_xapian.Error___str__)
        __swig_destroy__ = _xapian.delete_Error

    # Register Error in _xapian:
    _xapian.Error_swigregister(Error)

    class LogicError(Error):
        r"""

        The base class for exceptions indicating errors in the program logic.

        A subclass of LogicError will be thrown if Xapian detects a violation
        of a class invariant or a logical precondition or postcondition, etc.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined")
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_LogicError

    # Register LogicError in _xapian:
    _xapian.LogicError_swigregister(LogicError)

    class RuntimeError(Error):
        r"""

        The base class for exceptions indicating errors only detectable at
        runtime.

        A subclass of RuntimeError will be thrown if Xapian detects an error
        which is exception derived from RuntimeError is thrown when an error
        is caused by problems with the data or environment rather than a
        programming mistake.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined")
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_RuntimeError

    # Register RuntimeError in _xapian:
    _xapian.RuntimeError_swigregister(RuntimeError)

    class AssertionError(LogicError):
        r"""

        AssertionError is thrown if a logical assertion inside Xapian fails.

        In a debug build of Xapian, a failed assertion in the core library
        code will cause AssertionError to be thrown.

        This represents a bug in Xapian (either an invariant, precondition,
        etc has been violated, or the assertion is incorrect!)
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::AssertionError::AssertionError(std::string_view msg_, int
            errno_) Xapian::AssertionError::AssertionError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.AssertionError_swiginit(self, _xapian.new_AssertionError(*args))
        __swig_destroy__ = _xapian.delete_AssertionError

    # Register AssertionError in _xapian:
    _xapian.AssertionError_swigregister(AssertionError)

    class InvalidArgumentError(LogicError):
        r"""

        InvalidArgumentError indicates an invalid parameter value was passed
        to the API.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::InvalidArgumentError::InvalidArgumentError(std::string_view
            msg_, int errno_) Xapian::InvalidArgumentError::InvalidArgumentError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.InvalidArgumentError_swiginit(self, _xapian.new_InvalidArgumentError(*args))
        __swig_destroy__ = _xapian.delete_InvalidArgumentError

    # Register InvalidArgumentError in _xapian:
    _xapian.InvalidArgumentError_swigregister(InvalidArgumentError)

    class InvalidOperationError(LogicError):
        r"""

        InvalidOperationError indicates the API was used in an invalid way.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::InvalidOperationError::InvalidOperationError(std::string_view
            msg_, int errno_) Xapian::InvalidOperationError::InvalidOperationError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.InvalidOperationError_swiginit(self, _xapian.new_InvalidOperationError(*args))
        __swig_destroy__ = _xapian.delete_InvalidOperationError

    # Register InvalidOperationError in _xapian:
    _xapian.InvalidOperationError_swigregister(InvalidOperationError)

    class UnimplementedError(LogicError):
        r"""

        UnimplementedError indicates an attempt to use an unimplemented
        feature.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::UnimplementedError::UnimplementedError(std::string_view msg_,
            int errno_) Xapian::UnimplementedError::UnimplementedError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.UnimplementedError_swiginit(self, _xapian.new_UnimplementedError(*args))
        __swig_destroy__ = _xapian.delete_UnimplementedError

    # Register UnimplementedError in _xapian:
    _xapian.UnimplementedError_swigregister(UnimplementedError)

    class DatabaseError(RuntimeError):
        r"""

        DatabaseError indicates some sort of database related error.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseError::DatabaseError(std::string_view msg_, int
            errno_) Xapian::DatabaseError::DatabaseError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseError_swiginit(self, _xapian.new_DatabaseError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseError

    # Register DatabaseError in _xapian:
    _xapian.DatabaseError_swigregister(DatabaseError)

    class DatabaseCorruptError(DatabaseError):
        r"""

        DatabaseCorruptError indicates database corruption was detected.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseCorruptError::DatabaseCorruptError(std::string_view
            msg_, int errno_) Xapian::DatabaseCorruptError::DatabaseCorruptError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseCorruptError_swiginit(self, _xapian.new_DatabaseCorruptError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseCorruptError

    # Register DatabaseCorruptError in _xapian:
    _xapian.DatabaseCorruptError_swigregister(DatabaseCorruptError)

    class DatabaseCreateError(DatabaseError):
        r"""

        DatabaseCreateError indicates a failure to create a database.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseCreateError::DatabaseCreateError(std::string_view
            msg_, int errno_) Xapian::DatabaseCreateError::DatabaseCreateError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseCreateError_swiginit(self, _xapian.new_DatabaseCreateError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseCreateError

    # Register DatabaseCreateError in _xapian:
    _xapian.DatabaseCreateError_swigregister(DatabaseCreateError)

    class DatabaseLockError(DatabaseError):
        r"""

        DatabaseLockError indicates failure to lock a database.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseLockError::DatabaseLockError(std::string_view msg_,
            int errno_) Xapian::DatabaseLockError::DatabaseLockError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseLockError_swiginit(self, _xapian.new_DatabaseLockError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseLockError

    # Register DatabaseLockError in _xapian:
    _xapian.DatabaseLockError_swigregister(DatabaseLockError)

    class DatabaseModifiedError(DatabaseError):
        r"""

        DatabaseModifiedError indicates a database was modified.

        To recover after catching this error, you need to call
        Xapian::Database::reopen() on the Database and repeat the operation
        which failed.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseModifiedError::DatabaseModifiedError(std::string_view
            msg_, int errno_) Xapian::DatabaseModifiedError::DatabaseModifiedError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseModifiedError_swiginit(self, _xapian.new_DatabaseModifiedError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseModifiedError

    # Register DatabaseModifiedError in _xapian:
    _xapian.DatabaseModifiedError_swigregister(DatabaseModifiedError)

    class DatabaseOpeningError(DatabaseError):
        r"""

        DatabaseOpeningError indicates failure to open a database.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseOpeningError::DatabaseOpeningError(std::string_view
            msg_, int errno_) Xapian::DatabaseOpeningError::DatabaseOpeningError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseOpeningError_swiginit(self, _xapian.new_DatabaseOpeningError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseOpeningError

    # Register DatabaseOpeningError in _xapian:
    _xapian.DatabaseOpeningError_swigregister(DatabaseOpeningError)

    class DatabaseVersionError(DatabaseOpeningError):
        r"""

        DatabaseVersionError indicates that a database is in an unsupported
        format.

        From time to time, new versions of Xapian will require the database
        format to be changed, to allow new information to be stored or new
        optimisations to be performed. Backwards compatibility will sometimes
        be maintained, so that new versions of Xapian can open old databases,
        but in some cases Xapian will be unable to open a database because it
        is in too old (or new) a format. This can be resolved either be
        upgrading or downgrading the version of Xapian in use, or by
        rebuilding the database from scratch with the current version of
        Xapian.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseVersionError::DatabaseVersionError(std::string_view
            msg_, int errno_) Xapian::DatabaseVersionError::DatabaseVersionError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseVersionError_swiginit(self, _xapian.new_DatabaseVersionError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseVersionError

    # Register DatabaseVersionError in _xapian:
    _xapian.DatabaseVersionError_swigregister(DatabaseVersionError)

    class DocNotFoundError(RuntimeError):
        r"""

        Indicates an attempt to access a document not present in the database.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DocNotFoundError::DocNotFoundError(std::string_view msg_, int
            errno_) Xapian::DocNotFoundError::DocNotFoundError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DocNotFoundError_swiginit(self, _xapian.new_DocNotFoundError(*args))
        __swig_destroy__ = _xapian.delete_DocNotFoundError

    # Register DocNotFoundError in _xapian:
    _xapian.DocNotFoundError_swigregister(DocNotFoundError)

    class FeatureUnavailableError(RuntimeError):
        r"""

        Indicates an attempt to use a feature which is unavailable.

        Typically a feature is unavailable because it wasn't compiled in, or
        because it requires other software or facilities which aren't
        available.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::FeatureUnavailableError::FeatureUnavailableError(std::string_view
            msg_, int errno_)
            Xapian::FeatureUnavailableError::FeatureUnavailableError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.FeatureUnavailableError_swiginit(self, _xapian.new_FeatureUnavailableError(*args))
        __swig_destroy__ = _xapian.delete_FeatureUnavailableError

    # Register FeatureUnavailableError in _xapian:
    _xapian.FeatureUnavailableError_swigregister(FeatureUnavailableError)

    class InternalError(RuntimeError):
        r"""

        InternalError indicates a runtime problem of some sort.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::InternalError::InternalError(std::string_view msg_, int
            errno_) Xapian::InternalError::InternalError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.InternalError_swiginit(self, _xapian.new_InternalError(*args))
        __swig_destroy__ = _xapian.delete_InternalError

    # Register InternalError in _xapian:
    _xapian.InternalError_swigregister(InternalError)

    class NetworkError(RuntimeError):
        r"""

        Indicates a problem communicating with a remote database.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::NetworkError::NetworkError(std::string_view msg_, int errno_)
            Xapian::NetworkError::NetworkError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.NetworkError_swiginit(self, _xapian.new_NetworkError(*args))
        __swig_destroy__ = _xapian.delete_NetworkError

    # Register NetworkError in _xapian:
    _xapian.NetworkError_swigregister(NetworkError)

    class NetworkTimeoutError(NetworkError):
        r"""

        Indicates a timeout expired while communicating with a remote
        database.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::NetworkTimeoutError::NetworkTimeoutError(std::string_view
            msg_, int errno_) Xapian::NetworkTimeoutError::NetworkTimeoutError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.NetworkTimeoutError_swiginit(self, _xapian.new_NetworkTimeoutError(*args))
        __swig_destroy__ = _xapian.delete_NetworkTimeoutError

    # Register NetworkTimeoutError in _xapian:
    _xapian.NetworkTimeoutError_swigregister(NetworkTimeoutError)

    class QueryParserError(RuntimeError):
        r"""

        Indicates a query string can't be parsed.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::QueryParserError::QueryParserError(std::string_view msg_, int
            errno_) Xapian::QueryParserError::QueryParserError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.QueryParserError_swiginit(self, _xapian.new_QueryParserError(*args))
        __swig_destroy__ = _xapian.delete_QueryParserError

    # Register QueryParserError in _xapian:
    _xapian.QueryParserError_swigregister(QueryParserError)

    class SerialisationError(RuntimeError):
        r"""

        Indicates an error in the std::string serialisation of an object.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::SerialisationError::SerialisationError(std::string_view msg_,
            int errno_) Xapian::SerialisationError::SerialisationError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.SerialisationError_swiginit(self, _xapian.new_SerialisationError(*args))
        __swig_destroy__ = _xapian.delete_SerialisationError

    # Register SerialisationError in _xapian:
    _xapian.SerialisationError_swigregister(SerialisationError)

    class RangeError(RuntimeError):
        r"""

        RangeError indicates an attempt to access outside the bounds of a
        container.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::RangeError::RangeError(std::string_view msg_, int errno_)
            Xapian::RangeError::RangeError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.RangeError_swiginit(self, _xapian.new_RangeError(*args))
        __swig_destroy__ = _xapian.delete_RangeError

    # Register RangeError in _xapian:
    _xapian.RangeError_swigregister(RangeError)

    class WildcardError(RuntimeError):
        r"""

        WildcardError indicates an error expanding a wildcarded query.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::WildcardError::WildcardError(std::string_view msg_, int
            errno_) Xapian::WildcardError::WildcardError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.WildcardError_swiginit(self, _xapian.new_WildcardError(*args))
        __swig_destroy__ = _xapian.delete_WildcardError

    # Register WildcardError in _xapian:
    _xapian.WildcardError_swigregister(WildcardError)

    class DatabaseNotFoundError(DatabaseOpeningError):
        r"""

        Indicates an attempt to access a database not present.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseNotFoundError::DatabaseNotFoundError(std::string_view
            msg_, int errno_) Xapian::DatabaseNotFoundError::DatabaseNotFoundError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseNotFoundError_swiginit(self, _xapian.new_DatabaseNotFoundError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseNotFoundError

    # Register DatabaseNotFoundError in _xapian:
    _xapian.DatabaseNotFoundError_swigregister(DatabaseNotFoundError)

    class DatabaseClosedError(DatabaseError):
        r"""

        Indicates an attempt to access a closed database.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct from message and errno value.

            Xapian::DatabaseClosedError::DatabaseClosedError(std::string_view
            msg_, int errno_) Xapian::DatabaseClosedError::DatabaseClosedError

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseClosedError_swiginit(self, _xapian.new_DatabaseClosedError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseClosedError

    # Register DatabaseClosedError in _xapian:
    _xapian.DatabaseClosedError_swigregister(DatabaseClosedError)
    version_string = _xapian.version_string
    major_version = _xapian.major_version
    minor_version = _xapian.minor_version
    revision = _xapian.revision
    BAD_VALUENO = _xapian.BAD_VALUENO
    DB_CREATE = _xapian.DB_CREATE
    DB_CREATE_OR_OPEN = _xapian.DB_CREATE_OR_OPEN
    DB_CREATE_OR_OVERWRITE = _xapian.DB_CREATE_OR_OVERWRITE
    DB_OPEN = _xapian.DB_OPEN
    DB_NO_SYNC = _xapian.DB_NO_SYNC
    DB_FULL_SYNC = _xapian.DB_FULL_SYNC
    DB_DANGEROUS = _xapian.DB_DANGEROUS
    DB_NO_TERMLIST = _xapian.DB_NO_TERMLIST
    DB_BACKEND_GLASS = _xapian.DB_BACKEND_GLASS
    DB_BACKEND_HONEY = _xapian.DB_BACKEND_HONEY
    DB_BACKEND_INMEMORY = _xapian.DB_BACKEND_INMEMORY
    DB_BACKEND_STUB = _xapian.DB_BACKEND_STUB
    DB_RETRY_LOCK = _xapian.DB_RETRY_LOCK
    DBCHECK_SHORT_TREE = _xapian.DBCHECK_SHORT_TREE
    DBCHECK_FULL_TREE = _xapian.DBCHECK_FULL_TREE
    DBCHECK_SHOW_FREELIST = _xapian.DBCHECK_SHOW_FREELIST
    DBCHECK_SHOW_STATS = _xapian.DBCHECK_SHOW_STATS
    DBCHECK_FIX = _xapian.DBCHECK_FIX
    DBCOMPACT_MULTIPASS = _xapian.DBCOMPACT_MULTIPASS
    DBCOMPACT_NO_RENUMBER = _xapian.DBCOMPACT_NO_RENUMBER
    DBCOMPACT_SINGLE_FILE = _xapian.DBCOMPACT_SINGLE_FILE
    DOC_ASSUME_VALID = _xapian.DOC_ASSUME_VALID
    class _PositionIterator(object):
        r"""

        Class for iterating over term positions.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::PositionIterator::PositionIterator() noexcept
            Xapian::PositionIterator::PositionIterator Creates an uninitialised
            iterator, which can't be used before being assigned to, but is
            sometimes syntactically convenient.
            """
            _xapian._PositionIterator_swiginit(self, _xapian.new__PositionIterator())
        __swig_destroy__ = _xapian.delete__PositionIterator
        skip_to = _swig_new_instance_method(_xapian._PositionIterator_skip_to)
        __str__ = _swig_new_instance_method(_xapian._PositionIterator___str__)
        __eq__ = _swig_new_instance_method(_xapian._PositionIterator___eq__)
        __ne__ = _swig_new_instance_method(_xapian._PositionIterator___ne__)
        equals = _swig_new_instance_method(_xapian._PositionIterator_equals)
        get_termpos = _swig_new_instance_method(_xapian._PositionIterator_get_termpos)
        __next__ = _swig_new_instance_method(_xapian._PositionIterator___next__)

    # Register _PositionIterator in _xapian:
    _xapian._PositionIterator_swigregister(_PositionIterator)
    class _PostingIterator(object):
        r"""

        Class for iterating over a list of terms.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::PostingIterator::PostingIterator() noexcept
            Xapian::PostingIterator::PostingIterator Creates an uninitialised
            iterator, which can't be used before being assigned to, but is
            sometimes syntactically convenient.
            """
            _xapian._PostingIterator_swiginit(self, _xapian.new__PostingIterator())
        __swig_destroy__ = _xapian.delete__PostingIterator
        get_wdf = _swig_new_instance_method(_xapian._PostingIterator_get_wdf)
        get_doclength = _swig_new_instance_method(_xapian._PostingIterator_get_doclength)
        get_unique_terms = _swig_new_instance_method(_xapian._PostingIterator_get_unique_terms)
        get_wdfdocmax = _swig_new_instance_method(_xapian._PostingIterator_get_wdfdocmax)
        _positionlist_begin = _swig_new_instance_method(_xapian._PostingIterator__positionlist_begin)
        _positionlist_end = _swig_new_instance_method(_xapian._PostingIterator__positionlist_end)
        skip_to = _swig_new_instance_method(_xapian._PostingIterator_skip_to)
        __str__ = _swig_new_instance_method(_xapian._PostingIterator___str__)
        __eq__ = _swig_new_instance_method(_xapian._PostingIterator___eq__)
        __ne__ = _swig_new_instance_method(_xapian._PostingIterator___ne__)
        equals = _swig_new_instance_method(_xapian._PostingIterator_equals)
        get_docid = _swig_new_instance_method(_xapian._PostingIterator_get_docid)
        __next__ = _swig_new_instance_method(_xapian._PostingIterator___next__)

    # Register _PostingIterator in _xapian:
    _xapian._PostingIterator_swigregister(_PostingIterator)
    class _TermIterator(object):
        r"""

        Class for iterating over a list of terms.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::TermIterator::TermIterator() noexcept
            Xapian::TermIterator::TermIterator Creates an uninitialised iterator,
            which can't be used before being assigned to, but is sometimes
            syntactically convenient.
            """
            _xapian._TermIterator_swiginit(self, _xapian.new__TermIterator())
        __swig_destroy__ = _xapian.delete__TermIterator
        get_wdf = _swig_new_instance_method(_xapian._TermIterator_get_wdf)
        get_termfreq = _swig_new_instance_method(_xapian._TermIterator_get_termfreq)
        positionlist_count = _swig_new_instance_method(_xapian._TermIterator_positionlist_count)
        _positionlist_begin = _swig_new_instance_method(_xapian._TermIterator__positionlist_begin)
        _positionlist_end = _swig_new_instance_method(_xapian._TermIterator__positionlist_end)
        skip_to = _swig_new_instance_method(_xapian._TermIterator_skip_to)
        __str__ = _swig_new_instance_method(_xapian._TermIterator___str__)
        __eq__ = _swig_new_instance_method(_xapian._TermIterator___eq__)
        __ne__ = _swig_new_instance_method(_xapian._TermIterator___ne__)
        equals = _swig_new_instance_method(_xapian._TermIterator_equals)
        get_term = _swig_new_instance_method(_xapian._TermIterator_get_term)
        __next__ = _swig_new_instance_method(_xapian._TermIterator___next__)

    # Register _TermIterator in _xapian:
    _xapian._TermIterator_swigregister(_TermIterator)
    class _ValueIterator(object):
        r"""

        Class for iterating over document values.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::ValueIterator::ValueIterator() noexcept
            Xapian::ValueIterator::ValueIterator Creates an uninitialised
            iterator, which can't be used before being assigned to, but is
            sometimes syntactically convenient.
            """
            _xapian._ValueIterator_swiginit(self, _xapian.new__ValueIterator())
        __swig_destroy__ = _xapian.delete__ValueIterator
        get_docid = _swig_new_instance_method(_xapian._ValueIterator_get_docid)
        get_valueno = _swig_new_instance_method(_xapian._ValueIterator_get_valueno)
        skip_to = _swig_new_instance_method(_xapian._ValueIterator_skip_to)
        check = _swig_new_instance_method(_xapian._ValueIterator_check)
        __str__ = _swig_new_instance_method(_xapian._ValueIterator___str__)
        __eq__ = _swig_new_instance_method(_xapian._ValueIterator___eq__)
        __ne__ = _swig_new_instance_method(_xapian._ValueIterator___ne__)
        equals = _swig_new_instance_method(_xapian._ValueIterator_equals)
        get_value = _swig_new_instance_method(_xapian._ValueIterator_get_value)
        __next__ = _swig_new_instance_method(_xapian._ValueIterator___next__)

    # Register _ValueIterator in _xapian:
    _xapian._ValueIterator_swigregister(_ValueIterator)

    class Document(object):
        r"""

        Class representing a document.

        The term "document" shouldn't be taken too literally - really it's a
        "thing to retrieve", as the list of search results is essentially a
        list of documents.

        Document objects fetch information from the database lazily. Usually
        this behaviour isn't visible to users (except for the speed benefits),
        but if the document in the database is modified or deleted then
        preexisting Document objects may return the old or new versions of
        data (or throw Xapian::DocNotFoundError in the case of deletion).

        Since Database objects work on a snapshot of the database's state, the
        situation above can only happen with a WritableDatabase object, or if
        you call Database::reopen() on the Database object which you got the
        Document from.

        We recommend you avoid designs where this behaviour is an issue, but
        if you need a way to make a non-lazy version of a Document object, you
        can do this like so:doc =
        Xapian::Document::unserialise(doc.serialise());
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::Document::Document() Xapian::Document::Document Creates an
            empty Document.
            """
            _xapian.Document_swiginit(self, _xapian.new_Document())
        __swig_destroy__ = _xapian.delete_Document
        get_docid = _swig_new_instance_method(_xapian.Document_get_docid)
        get_data = _swig_new_instance_method(_xapian.Document_get_data)
        set_data = _swig_new_instance_method(_xapian.Document_set_data)
        add_term = _swig_new_instance_method(_xapian.Document_add_term)
        add_boolean_term = _swig_new_instance_method(_xapian.Document_add_boolean_term)
        remove_term = _swig_new_instance_method(_xapian.Document_remove_term)
        add_posting = _swig_new_instance_method(_xapian.Document_add_posting)
        remove_posting = _swig_new_instance_method(_xapian.Document_remove_posting)
        remove_postings = _swig_new_instance_method(_xapian.Document_remove_postings)
        clear_terms = _swig_new_instance_method(_xapian.Document_clear_terms)
        termlist_count = _swig_new_instance_method(_xapian.Document_termlist_count)
        _termlist_begin = _swig_new_instance_method(_xapian.Document__termlist_begin)
        _termlist_end = _swig_new_instance_method(_xapian.Document__termlist_end)
        get_value = _swig_new_instance_method(_xapian.Document_get_value)
        add_value = _swig_new_instance_method(_xapian.Document_add_value)
        remove_value = _swig_new_instance_method(_xapian.Document_remove_value)
        clear_values = _swig_new_instance_method(_xapian.Document_clear_values)
        values_count = _swig_new_instance_method(_xapian.Document_values_count)
        _values_begin = _swig_new_instance_method(_xapian.Document__values_begin)
        _values_end = _swig_new_instance_method(_xapian.Document__values_end)
        serialise = _swig_new_instance_method(_xapian.Document_serialise)
        unserialise = _swig_new_static_method(_xapian.Document_unserialise)
        __str__ = _swig_new_instance_method(_xapian.Document___str__)

    # Register Document in _xapian:
    _xapian.Document_swigregister(Document)

    class Registry(object):
        r"""

        Registry for user subclasses.

        This class provides a way for the remote server to look up user
        subclasses when unserialising.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::Registry::Registry() Xapian::Registry::Registry The registry
            will contain all standard subclasses of user-subclassable classes.
            """
            _xapian.Registry_swiginit(self, _xapian.new_Registry())
        __swig_destroy__ = _xapian.delete_Registry
        register_weighting_scheme = _swig_new_instance_method(_xapian.Registry_register_weighting_scheme)
        get_weighting_scheme = _swig_new_instance_method(_xapian.Registry_get_weighting_scheme)
        register_posting_source = _swig_new_instance_method(_xapian.Registry_register_posting_source)
        get_posting_source = _swig_new_instance_method(_xapian.Registry_get_posting_source)
        register_match_spy = _swig_new_instance_method(_xapian.Registry_register_match_spy)
        get_match_spy = _swig_new_instance_method(_xapian.Registry_get_match_spy)
        register_lat_long_metric = _swig_new_instance_method(_xapian.Registry_register_lat_long_metric)
        get_lat_long_metric = _swig_new_instance_method(_xapian.Registry_get_lat_long_metric)
        register_key_maker = _swig_new_instance_method(_xapian.Registry_register_key_maker)
        get_key_maker = _swig_new_instance_method(_xapian.Registry_get_key_maker)

    # Register Registry in _xapian:
    _xapian.Registry_swigregister(Registry)

    class Query(object):
        r"""

        Class representing a query.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        OP_AND = _xapian.Query_OP_AND
        OP_OR = _xapian.Query_OP_OR
        OP_AND_NOT = _xapian.Query_OP_AND_NOT
        OP_XOR = _xapian.Query_OP_XOR
        OP_AND_MAYBE = _xapian.Query_OP_AND_MAYBE
        OP_FILTER = _xapian.Query_OP_FILTER
        OP_NEAR = _xapian.Query_OP_NEAR
        OP_PHRASE = _xapian.Query_OP_PHRASE
        OP_VALUE_RANGE = _xapian.Query_OP_VALUE_RANGE
        OP_SCALE_WEIGHT = _xapian.Query_OP_SCALE_WEIGHT
        OP_ELITE_SET = _xapian.Query_OP_ELITE_SET
        OP_VALUE_GE = _xapian.Query_OP_VALUE_GE
        OP_VALUE_LE = _xapian.Query_OP_VALUE_LE
        OP_SYNONYM = _xapian.Query_OP_SYNONYM
        OP_MAX = _xapian.Query_OP_MAX
        OP_WILDCARD = _xapian.Query_OP_WILDCARD
        OP_EDIT_DISTANCE = _xapian.Query_OP_EDIT_DISTANCE
        OP_INVALID = _xapian.Query_OP_INVALID
        WILDCARD_LIMIT_ERROR = _xapian.Query_WILDCARD_LIMIT_ERROR
        WILDCARD_LIMIT_FIRST = _xapian.Query_WILDCARD_LIMIT_FIRST
        WILDCARD_LIMIT_MOST_FREQUENT = _xapian.Query_WILDCARD_LIMIT_MOST_FREQUENT
        WILDCARD_PATTERN_MULTI = _xapian.Query_WILDCARD_PATTERN_MULTI
        WILDCARD_PATTERN_SINGLE = _xapian.Query_WILDCARD_PATTERN_SINGLE
        WILDCARD_PATTERN_GLOB = _xapian.Query_WILDCARD_PATTERN_GLOB
        __swig_destroy__ = _xapian.delete_Query
        _get_terms_begin = _swig_new_instance_method(_xapian.Query__get_terms_begin)
        _get_terms_end = _swig_new_instance_method(_xapian.Query__get_terms_end)
        get_unique_terms_begin = _swig_new_instance_method(_xapian.Query_get_unique_terms_begin)
        get_unique_terms_end = _swig_new_instance_method(_xapian.Query_get_unique_terms_end)
        get_length = _swig_new_instance_method(_xapian.Query_get_length)
        empty = _swig_new_instance_method(_xapian.Query_empty)
        serialise = _swig_new_instance_method(_xapian.Query_serialise)
        unserialise = _swig_new_static_method(_xapian.Query_unserialise)
        get_type = _swig_new_instance_method(_xapian.Query_get_type)
        get_num_subqueries = _swig_new_instance_method(_xapian.Query_get_num_subqueries)
        get_leaf_wqf = _swig_new_instance_method(_xapian.Query_get_leaf_wqf)
        get_leaf_pos = _swig_new_instance_method(_xapian.Query_get_leaf_pos)
        get_subquery = _swig_new_instance_method(_xapian.Query_get_subquery)
        __str__ = _swig_new_instance_method(_xapian.Query___str__)

        def __init__(self, *args):
            r"""

            Construct with just an operator.

            Xapian::Query::Query(Query::op op_) Xapian::Query::Query

            Parameters:
            -----------

            op_:  The operator to use - currently only OP_INVALID is useful.
            """
            _xapian.Query_swiginit(self, _xapian.new_Query(*args))

    # Register Query in _xapian:
    _xapian.Query_swigregister(Query)

    class StemImplementation(object):
        r"""

        Class representing a stemming algorithm implementation.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::StemImplementation::StemImplementation()
            Xapian::StemImplementation::StemImplementation
            """
            if self.__class__ == StemImplementation:
                _self = None
            else:
                _self = self
            _xapian.StemImplementation_swiginit(self, _xapian.new_StemImplementation(_self, ))
        __swig_destroy__ = _xapian.delete_StemImplementation
        __call__ = _swig_new_instance_method(_xapian.StemImplementation___call__)
        use_proper_noun_heuristic = _swig_new_instance_method(_xapian.StemImplementation_use_proper_noun_heuristic)
        __str__ = _swig_new_instance_method(_xapian.StemImplementation___str__)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_StemImplementation(self)
            return weakref.proxy(self)

    # Register StemImplementation in _xapian:
    _xapian.StemImplementation_swigregister(StemImplementation)

    class Stem(object):
        r"""

        Class representing a stemming algorithm.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct a Xapian::Stem object with a user-provided stemming
            algorithm.

            Xapian::Stem::Stem(StemImplementation *p) Xapian::Stem::Stem You can
            subclass Xapian::StemImplementation to implement your own stemming
            algorithm (or to wrap a third-party algorithm) and then wrap your
            implementation in a Xapian::Stem object to pass to the Xapian API.

            Parameters:
            -----------

            p:  The user-subclassed StemImplementation object. This is reference
            counted, and so will be automatically deleted by the Xapian::Stem
            wrapper when no longer required.
            """
            _xapian.Stem_swiginit(self, _xapian.new_Stem(*args))
        __swig_destroy__ = _xapian.delete_Stem
        __call__ = _swig_new_instance_method(_xapian.Stem___call__)
        is_none = _swig_new_instance_method(_xapian.Stem_is_none)
        __str__ = _swig_new_instance_method(_xapian.Stem___str__)
        get_available_languages = _swig_new_static_method(_xapian.Stem_get_available_languages)

    # Register Stem in _xapian:
    _xapian.Stem_swigregister(Stem)

    class TermGenerator(object):
        r"""

        Parses a piece of text and generate terms.

        This module takes a piece of text and parses it to produce words which
        are then used to generate suitable terms for indexing. The terms
        generated are suitable for use with Query objects produced by the
        QueryParser class.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::TermGenerator::TermGenerator()
            Xapian::TermGenerator::TermGenerator
            """
            _xapian.TermGenerator_swiginit(self, _xapian.new_TermGenerator())
        __swig_destroy__ = _xapian.delete_TermGenerator
        set_stemmer = _swig_new_instance_method(_xapian.TermGenerator_set_stemmer)
        set_stopper = _swig_new_instance_method(_xapian.TermGenerator_set_stopper)
        set_document = _swig_new_instance_method(_xapian.TermGenerator_set_document)
        get_document = _swig_new_instance_method(_xapian.TermGenerator_get_document)
        set_database = _swig_new_instance_method(_xapian.TermGenerator_set_database)
        FLAG_SPELLING = _xapian.TermGenerator_FLAG_SPELLING
        FLAG_NGRAMS = _xapian.TermGenerator_FLAG_NGRAMS
        FLAG_CJK_NGRAM = _xapian.TermGenerator_FLAG_CJK_NGRAM
        FLAG_WORD_BREAKS = _xapian.TermGenerator_FLAG_WORD_BREAKS
        STEM_NONE = _xapian.TermGenerator_STEM_NONE
        STEM_SOME = _xapian.TermGenerator_STEM_SOME
        STEM_ALL = _xapian.TermGenerator_STEM_ALL
        STEM_ALL_Z = _xapian.TermGenerator_STEM_ALL_Z
        STEM_SOME_FULL_POS = _xapian.TermGenerator_STEM_SOME_FULL_POS
        STOP_NONE = _xapian.TermGenerator_STOP_NONE
        STOP_ALL = _xapian.TermGenerator_STOP_ALL
        STOP_STEMMED = _xapian.TermGenerator_STOP_STEMMED
        set_flags = _swig_new_instance_method(_xapian.TermGenerator_set_flags)
        set_stemming_strategy = _swig_new_instance_method(_xapian.TermGenerator_set_stemming_strategy)
        set_stopper_strategy = _swig_new_instance_method(_xapian.TermGenerator_set_stopper_strategy)
        set_max_word_length = _swig_new_instance_method(_xapian.TermGenerator_set_max_word_length)
        index_text = _swig_new_instance_method(_xapian.TermGenerator_index_text)
        index_text_without_positions = _swig_new_instance_method(_xapian.TermGenerator_index_text_without_positions)
        increase_termpos = _swig_new_instance_method(_xapian.TermGenerator_increase_termpos)
        get_termpos = _swig_new_instance_method(_xapian.TermGenerator_get_termpos)
        set_termpos = _swig_new_instance_method(_xapian.TermGenerator_set_termpos)
        set_termpos_limit = _swig_new_instance_method(_xapian.TermGenerator_set_termpos_limit)
        __str__ = _swig_new_instance_method(_xapian.TermGenerator___str__)

    # Register TermGenerator in _xapian:
    _xapian.TermGenerator_swigregister(TermGenerator)

    class MSet(object):
        r"""

        Class representing a list of search results.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::MSet::MSet() Xapian::MSet::MSet Creates an empty MSet, mostly
            useful as a placeholder.
            """
            _xapian.MSet_swiginit(self, _xapian.new_MSet())
        __swig_destroy__ = _xapian.delete_MSet
        sort_by_relevance = _swig_new_instance_method(_xapian.MSet_sort_by_relevance)
        convert_to_percent = _swig_new_instance_method(_xapian.MSet_convert_to_percent)
        get_termfreq = _swig_new_instance_method(_xapian.MSet_get_termfreq)
        get_termweight = _swig_new_instance_method(_xapian.MSet_get_termweight)
        get_firstitem = _swig_new_instance_method(_xapian.MSet_get_firstitem)
        get_matches_lower_bound = _swig_new_instance_method(_xapian.MSet_get_matches_lower_bound)
        get_matches_estimated = _swig_new_instance_method(_xapian.MSet_get_matches_estimated)
        get_matches_upper_bound = _swig_new_instance_method(_xapian.MSet_get_matches_upper_bound)
        get_uncollapsed_matches_lower_bound = _swig_new_instance_method(_xapian.MSet_get_uncollapsed_matches_lower_bound)
        get_uncollapsed_matches_estimated = _swig_new_instance_method(_xapian.MSet_get_uncollapsed_matches_estimated)
        get_uncollapsed_matches_upper_bound = _swig_new_instance_method(_xapian.MSet_get_uncollapsed_matches_upper_bound)
        get_max_attained = _swig_new_instance_method(_xapian.MSet_get_max_attained)
        get_max_possible = _swig_new_instance_method(_xapian.MSet_get_max_possible)
        SNIPPET_BACKGROUND_MODEL = _xapian.MSet_SNIPPET_BACKGROUND_MODEL
        SNIPPET_EXHAUSTIVE = _xapian.MSet_SNIPPET_EXHAUSTIVE
        SNIPPET_EMPTY_WITHOUT_MATCH = _xapian.MSet_SNIPPET_EMPTY_WITHOUT_MATCH
        SNIPPET_NGRAMS = _xapian.MSet_SNIPPET_NGRAMS
        SNIPPET_CJK_NGRAM = _xapian.MSet_SNIPPET_CJK_NGRAM
        SNIPPET_WORD_BREAKS = _xapian.MSet_SNIPPET_WORD_BREAKS
        snippet = _swig_new_instance_method(_xapian.MSet_snippet)
        fetch = _swig_new_instance_method(_xapian.MSet_fetch)
        size = _swig_new_instance_method(_xapian.MSet_size)
        empty = _swig_new_instance_method(_xapian.MSet_empty)
        _begin = _swig_new_instance_method(_xapian.MSet__begin)
        _end = _swig_new_instance_method(_xapian.MSet__end)
        back = _swig_new_instance_method(_xapian.MSet_back)
        __str__ = _swig_new_instance_method(_xapian.MSet___str__)
        get_docid = _swig_new_instance_method(_xapian.MSet_get_docid)
        get_document = _swig_new_instance_method(_xapian.MSet_get_document)
        _get_hit_internal = _swig_new_instance_method(_xapian.MSet__get_hit_internal)
        get_document_percentage = _swig_new_instance_method(_xapian.MSet_get_document_percentage)

    # Register MSet in _xapian:
    _xapian.MSet_swigregister(MSet)
    class _MSetIterator(object):
        r"""

        Iterator over a Xapian::MSet.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        mset = property(_xapian._MSetIterator_mset_get, _xapian._MSetIterator_mset_set)
        off_from_end = property(_xapian._MSetIterator_off_from_end_get, _xapian._MSetIterator_off_from_end_set)

        def __init__(self):
            r"""

            Create an unpositioned MSetIterator.

            Xapian::MSetIterator::MSetIterator()
            Xapian::MSetIterator::MSetIterator
            """
            _xapian._MSetIterator_swiginit(self, _xapian.new__MSetIterator())
        get_rank = _swig_new_instance_method(_xapian._MSetIterator_get_rank)
        get_document = _swig_new_instance_method(_xapian._MSetIterator_get_document)
        get_weight = _swig_new_instance_method(_xapian._MSetIterator_get_weight)
        get_collapse_key = _swig_new_instance_method(_xapian._MSetIterator_get_collapse_key)
        get_collapse_count = _swig_new_instance_method(_xapian._MSetIterator_get_collapse_count)
        get_sort_key = _swig_new_instance_method(_xapian._MSetIterator_get_sort_key)
        get_percent = _swig_new_instance_method(_xapian._MSetIterator_get_percent)
        __str__ = _swig_new_instance_method(_xapian._MSetIterator___str__)
        __eq__ = _swig_new_instance_method(_xapian._MSetIterator___eq__)
        __ne__ = _swig_new_instance_method(_xapian._MSetIterator___ne__)
        equals = _swig_new_instance_method(_xapian._MSetIterator_equals)
        get_docid = _swig_new_instance_method(_xapian._MSetIterator_get_docid)
        __next__ = _swig_new_instance_method(_xapian._MSetIterator___next__)
        prev = _swig_new_instance_method(_xapian._MSetIterator_prev)
        __swig_destroy__ = _xapian.delete__MSetIterator

    # Register _MSetIterator in _xapian:
    _xapian._MSetIterator_swigregister(_MSetIterator)

    class ESet(object):
        r"""

        Class representing a list of search results.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::ESet::ESet() Xapian::ESet::ESet Creates an empty ESet, mostly
            useful as a placeholder.
            """
            _xapian.ESet_swiginit(self, _xapian.new_ESet())
        __swig_destroy__ = _xapian.delete_ESet
        size = _swig_new_instance_method(_xapian.ESet_size)
        empty = _swig_new_instance_method(_xapian.ESet_empty)
        get_ebound = _swig_new_instance_method(_xapian.ESet_get_ebound)
        _begin = _swig_new_instance_method(_xapian.ESet__begin)
        _end = _swig_new_instance_method(_xapian.ESet__end)
        back = _swig_new_instance_method(_xapian.ESet_back)
        __str__ = _swig_new_instance_method(_xapian.ESet___str__)

    # Register ESet in _xapian:
    _xapian.ESet_swigregister(ESet)
    class _ESetIterator(object):
        r"""

        Iterator over a Xapian::ESet.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        eset = property(_xapian._ESetIterator_eset_get, _xapian._ESetIterator_eset_set)
        off_from_end = property(_xapian._ESetIterator_off_from_end_get, _xapian._ESetIterator_off_from_end_set)

        def __init__(self):
            r"""

            Create an unpositioned ESetIterator.

            Xapian::ESetIterator::ESetIterator()
            Xapian::ESetIterator::ESetIterator
            """
            _xapian._ESetIterator_swiginit(self, _xapian.new__ESetIterator())
        get_weight = _swig_new_instance_method(_xapian._ESetIterator_get_weight)
        __str__ = _swig_new_instance_method(_xapian._ESetIterator___str__)
        __eq__ = _swig_new_instance_method(_xapian._ESetIterator___eq__)
        __ne__ = _swig_new_instance_method(_xapian._ESetIterator___ne__)
        equals = _swig_new_instance_method(_xapian._ESetIterator_equals)
        get_term = _swig_new_instance_method(_xapian._ESetIterator_get_term)
        __next__ = _swig_new_instance_method(_xapian._ESetIterator___next__)
        prev = _swig_new_instance_method(_xapian._ESetIterator_prev)
        __swig_destroy__ = _xapian.delete__ESetIterator

    # Register _ESetIterator in _xapian:
    _xapian._ESetIterator_swigregister(_ESetIterator)
    __eq__ = _xapian.__eq__
    __lt__ = _xapian.__lt__
    __gt__ = _xapian.__gt__
    __ge__ = _xapian.__ge__
    __le__ = _xapian.__le__
    __add__ = _xapian.__add__

    class RSet(object):
        r"""

        Class representing a set of documents judged as relevant.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::RSet::RSet() Xapian::RSet::RSet Creates an empty RSet.
            """
            _xapian.RSet_swiginit(self, _xapian.new_RSet())
        __swig_destroy__ = _xapian.delete_RSet
        size = _swig_new_instance_method(_xapian.RSet_size)
        empty = _swig_new_instance_method(_xapian.RSet_empty)
        add_document = _swig_new_instance_method(_xapian.RSet_add_document)
        remove_document = _swig_new_instance_method(_xapian.RSet_remove_document)
        contains = _swig_new_instance_method(_xapian.RSet_contains)
        __str__ = _swig_new_instance_method(_xapian.RSet___str__)

    # Register RSet in _xapian:
    _xapian.RSet_swigregister(RSet)

    class MatchDecider(object):
        r"""

        Abstract base class for match deciders.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor, needed by subclass constructors.

            Xapian::MatchDecider::MatchDecider() noexcept
            Xapian::MatchDecider::MatchDecider
            """
            if self.__class__ == MatchDecider:
                _self = None
            else:
                _self = self
            _xapian.MatchDecider_swiginit(self, _xapian.new_MatchDecider(_self, ))
        __swig_destroy__ = _xapian.delete_MatchDecider
        __call__ = _swig_new_instance_method(_xapian.MatchDecider___call__)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_MatchDecider(self)
            return weakref.proxy(self)

    # Register MatchDecider in _xapian:
    _xapian.MatchDecider_swigregister(MatchDecider)

    class Enquire(object):
        r"""

        Querying session.

        An Enquire object represents a querying session - most of the options
        for running a query can be set on it, and the query is run via
        Enquire::get_mset().
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, db):
            r"""

            Constructor.

            Xapian::Enquire::Enquire(const Database &db) Xapian::Enquire::Enquire

            Parameters:
            -----------

            db:  The database (or databases) to query.

            2.0.0 If db has no subdatabases, it's handled like any other empty
            database. In earlier versions, Xapian::InvalidArgumentError was thrown
            in this case.
            """
            _xapian.Enquire_swiginit(self, _xapian.new_Enquire(db))
        __swig_destroy__ = _xapian.delete_Enquire
        set_query = _swig_new_instance_method(_xapian.Enquire_set_query)
        get_query = _swig_new_instance_method(_xapian.Enquire_get_query)
        set_weighting_scheme = _swig_new_instance_method(_xapian.Enquire_set_weighting_scheme)
        ASCENDING = _xapian.Enquire_ASCENDING
        DESCENDING = _xapian.Enquire_DESCENDING
        DONT_CARE = _xapian.Enquire_DONT_CARE
        set_docid_order = _swig_new_instance_method(_xapian.Enquire_set_docid_order)
        set_sort_by_relevance = _swig_new_instance_method(_xapian.Enquire_set_sort_by_relevance)
        set_sort_by_value = _swig_new_instance_method(_xapian.Enquire_set_sort_by_value)
        set_sort_by_key = _swig_new_instance_method(_xapian.Enquire_set_sort_by_key)
        set_sort_by_value_then_relevance = _swig_new_instance_method(_xapian.Enquire_set_sort_by_value_then_relevance)
        set_sort_by_key_then_relevance = _swig_new_instance_method(_xapian.Enquire_set_sort_by_key_then_relevance)
        set_sort_by_relevance_then_value = _swig_new_instance_method(_xapian.Enquire_set_sort_by_relevance_then_value)
        set_sort_by_relevance_then_key = _swig_new_instance_method(_xapian.Enquire_set_sort_by_relevance_then_key)
        set_collapse_key = _swig_new_instance_method(_xapian.Enquire_set_collapse_key)
        set_cutoff = _swig_new_instance_method(_xapian.Enquire_set_cutoff)
        add_matchspy = _swig_new_instance_method(_xapian.Enquire_add_matchspy)
        clear_matchspies = _swig_new_instance_method(_xapian.Enquire_clear_matchspies)
        set_time_limit = _swig_new_instance_method(_xapian.Enquire_set_time_limit)
        get_mset = _swig_new_instance_method(_xapian.Enquire_get_mset)
        _get_matching_terms_begin = _swig_new_instance_method(_xapian.Enquire__get_matching_terms_begin)
        _get_matching_terms_end = _swig_new_instance_method(_xapian.Enquire__get_matching_terms_end)
        set_expansion_scheme = _swig_new_instance_method(_xapian.Enquire_set_expansion_scheme)
        INCLUDE_QUERY_TERMS = _xapian.Enquire_INCLUDE_QUERY_TERMS
        USE_EXACT_TERMFREQ = _xapian.Enquire_USE_EXACT_TERMFREQ
        get_eset = _swig_new_instance_method(_xapian.Enquire_get_eset)
        __str__ = _swig_new_instance_method(_xapian.Enquire___str__)

    # Register Enquire in _xapian:
    _xapian.Enquire_swigregister(Enquire)

    class ExpandDecider(object):
        r"""

        Virtual base class for expand decider functor.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::ExpandDecider::ExpandDecider()
            Xapian::ExpandDecider::ExpandDecider
            """
            if self.__class__ == ExpandDecider:
                _self = None
            else:
                _self = self
            _xapian.ExpandDecider_swiginit(self, _xapian.new_ExpandDecider(_self, ))
        __call__ = _swig_new_instance_method(_xapian.ExpandDecider___call__)
        __swig_destroy__ = _xapian.delete_ExpandDecider
        release = _swig_new_instance_method(_xapian.ExpandDecider_release)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_ExpandDecider(self)
            return weakref.proxy(self)

    # Register ExpandDecider in _xapian:
    _xapian.ExpandDecider_swigregister(ExpandDecider)

    class ExpandDeciderAnd(ExpandDecider):
        r"""

        ExpandDecider subclass which rejects terms using two ExpandDeciders.

        Terms are only accepted if they are accepted by both of the specified
        ExpandDecider objects.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, first_, second_):
            r"""

            Compatibility method.

            Xapian::ExpandDeciderAnd::ExpandDeciderAnd(const ExpandDecider
            *first_, const ExpandDecider *second_)
            Xapian::ExpandDeciderAnd::ExpandDeciderAnd

            Parameters:
            -----------

            first_:  First ExpandDecider object to test with.

            second_:   ExpandDecider object to test with if first_ accepts.
            """
            _xapian.ExpandDeciderAnd_swiginit(self, _xapian.new_ExpandDeciderAnd(first_, second_))
        __swig_destroy__ = _xapian.delete_ExpandDeciderAnd

    # Register ExpandDeciderAnd in _xapian:
    _xapian.ExpandDeciderAnd_swigregister(ExpandDeciderAnd)

    class ExpandDeciderFilterPrefix(ExpandDecider):
        r"""

        ExpandDecider subclass which restrict terms to a particular prefix.

        ExpandDeciderFilterPrefix provides an easy way to choose terms with a
        particular prefix when generating an ESet.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, prefix_):
            r"""

            The parameter specify the prefix of terms to be retained.

            Xapian::ExpandDeciderFilterPrefix::ExpandDeciderFilterPrefix(const
            std::string &prefix_)
            Xapian::ExpandDeciderFilterPrefix::ExpandDeciderFilterPrefix

            Parameters:
            -----------

            prefix_:  restrict terms to the particular prefix_
            """
            _xapian.ExpandDeciderFilterPrefix_swiginit(self, _xapian.new_ExpandDeciderFilterPrefix(prefix_))
        __swig_destroy__ = _xapian.delete_ExpandDeciderFilterPrefix

    # Register ExpandDeciderFilterPrefix in _xapian:
    _xapian.ExpandDeciderFilterPrefix_swigregister(ExpandDeciderFilterPrefix)

    class KeyMaker(object):
        r"""

        Virtual base class for key making functors.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::KeyMaker::KeyMaker() Xapian::KeyMaker::KeyMaker
            """
            if self.__class__ == KeyMaker:
                _self = None
            else:
                _self = self
            _xapian.KeyMaker_swiginit(self, _xapian.new_KeyMaker(_self, ))
        __call__ = _swig_new_instance_method(_xapian.KeyMaker___call__)
        __swig_destroy__ = _xapian.delete_KeyMaker
        name = _swig_new_instance_method(_xapian.KeyMaker_name)
        release = _swig_new_instance_method(_xapian.KeyMaker_release)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_KeyMaker(self)
            return weakref.proxy(self)

    # Register KeyMaker in _xapian:
    _xapian.KeyMaker_swigregister(KeyMaker)

    class MultiValueKeyMaker(KeyMaker):
        r"""

        KeyMaker subclass which combines several values.

        When the result is used for sorting, results are ordered by the first
        value. In the event of a tie, the second is used. If this is the same
        for both, the third is used, and so on. If reverse is true for a
        value, then the sort order for that value is reversed.

        When used for collapsing, the documents will only be considered equal
        if all the values specified match. If none of the specified values are
        set then the generated key will be empty, so such documents won't be
        collapsed (which is consistent with the behaviour in the "collapse on
        a value" case). If you'd prefer that documents with none of the keys
        set are collapsed together, then you can set reverse for at least one
        of the values. Other than this, it isn't useful to set reverse for
        collapsing.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Construct a MultiValueKeyMaker from a pair of iterators.

            Xapian::MultiValueKeyMaker::MultiValueKeyMaker(Iterator begin,
            Iterator end) Xapian::MultiValueKeyMaker::MultiValueKeyMaker The
            iterators must be a begin/end pair returning Xapian::valueno (or a
            compatible type) when dereferenced.
            """
            _xapian.MultiValueKeyMaker_swiginit(self, _xapian.new_MultiValueKeyMaker())
        add_value = _swig_new_instance_method(_xapian.MultiValueKeyMaker_add_value)
        __swig_destroy__ = _xapian.delete_MultiValueKeyMaker

    # Register MultiValueKeyMaker in _xapian:
    _xapian.MultiValueKeyMaker_swigregister(MultiValueKeyMaker)
    RP_SUFFIX = _xapian.RP_SUFFIX
    RP_REPEATED = _xapian.RP_REPEATED
    RP_DATE_PREFER_MDY = _xapian.RP_DATE_PREFER_MDY

    class Stopper(object):
        r"""

        Abstract base class for stop-word decision functor.

        If you just want to use an existing stopword list, see
        Xapian::SimpleStopper.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::Stopper::Stopper() Xapian::Stopper::Stopper
            """
            if self.__class__ == Stopper:
                _self = None
            else:
                _self = self
            _xapian.Stopper_swiginit(self, _xapian.new_Stopper(_self, ))
        __call__ = _swig_new_instance_method(_xapian.Stopper___call__)
        __swig_destroy__ = _xapian.delete_Stopper
        __str__ = _swig_new_instance_method(_xapian.Stopper___str__)
        release = _swig_new_instance_method(_xapian.Stopper_release)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_Stopper(self)
            return weakref.proxy(self)

    # Register Stopper in _xapian:
    _xapian.Stopper_swigregister(Stopper)

    class SimpleStopper(Stopper):
        r"""

        Simple implementation of Stopper class - this will suit most users.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        add = _swig_new_instance_method(_xapian.SimpleStopper_add)

        def __init__(self, *args):
            r"""

            Initialise from a pair of iterators.

            Xapian::SimpleStopper::SimpleStopper(Iterator begin, Iterator end)
            Xapian::SimpleStopper::SimpleStopper  Xapian includes stopword list
            files for many languages. You can initialise from a file like so:

            In bindings for other languages it isn't possible to pass a C++
            iterator pair, so instead this constructor is wrapped to allow passing
            a filename.
            """
            _xapian.SimpleStopper_swiginit(self, _xapian.new_SimpleStopper(*args))
        __swig_destroy__ = _xapian.delete_SimpleStopper

    # Register SimpleStopper in _xapian:
    _xapian.SimpleStopper_swigregister(SimpleStopper)

    class RangeProcessor(object):
        r"""

        Base class for range processors.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Constructor.

            Xapian::RangeProcessor::RangeProcessor(Xapian::valueno slot_,
            std::string_view str_={}, unsigned flags_=0)
            Xapian::RangeProcessor::RangeProcessor

            Parameters:
            -----------

            slot_:  Which value slot to generate ranges over.

            str_:  A string to look for to recognise values as belonging to this
            range (as a prefix by default, or as a suffix if flags
            Xapian::RP_SUFFIX is specified).

            flags_:  Zero or more of the following flags, combined with bitwise-or
            (| in C++): Xapian::RP_SUFFIX - require str_ as a suffix instead of a
            prefix.

            Xapian::RP_REPEATED - optionally allow str_ on both ends of the range,
            or only on the non-empty end - e.g. $1..$10, ..$10, 5m..50m, or 5m...
            By default a prefix is only checked for on the start (e.g.
            date:1/1/1980..31/12/1989 or date:..31/12/1989), and a suffix only on
            the end (e.g. 2..12kg or 2..kg).
            """
            if self.__class__ == RangeProcessor:
                _self = None
            else:
                _self = self
            _xapian.RangeProcessor_swiginit(self, _xapian.new_RangeProcessor(_self, *args))
        __swig_destroy__ = _xapian.delete_RangeProcessor
        check_range = _swig_new_instance_method(_xapian.RangeProcessor_check_range)
        __call__ = _swig_new_instance_method(_xapian.RangeProcessor___call__)
        release = _swig_new_instance_method(_xapian.RangeProcessor_release)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_RangeProcessor(self)
            return weakref.proxy(self)

    # Register RangeProcessor in _xapian:
    _xapian.RangeProcessor_swigregister(RangeProcessor)

    class DateRangeProcessor(RangeProcessor):
        r"""

        Handle a date range.

        Begin and end must be dates in a recognised format.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Constructor.

            Xapian::DateRangeProcessor::DateRangeProcessor(Xapian::valueno slot_,
            std::string_view str_, unsigned flags_=0, int epoch_year_=1970)
            Xapian::DateRangeProcessor::DateRangeProcessor

            Parameters:
            -----------

            slot_:  The value slot number to query.

            str_:  A prefix or suffix string to look for to recognise values as
            belonging to this date range ( flags_ determines whether this is a
            prefix or suffix).

            flags_:  Zero or more of the following flags, combined with bitwise-
            or: Xapian::RP_SUFFIX - require str_ as a suffix instead of a prefix.

            Xapian::RP_REPEATED - optionally allow str_ on both ends of the range
            - e.g. $1..$10 or 5m..50m. By default a prefix is only checked for on
            the start (e.g. date:1/1/1980..31/12/1989), and a suffix only on the
            end (e.g. 2..12kg).

            Xapian::RP_DATE_PREFER_MDY - interpret ambiguous dates as
            month/day/year rather than day/month/year.

            epoch_year_:  Year to use as the epoch for dates with 2 digit years
            (default: 1970, so 1/1/69 is 2069 while 1/1/70 is 1970).

            The string supplied in str_ is used by operator() to decide whether
            the pair of strings supplied to it constitute a valid range. If
            prefix_ is true, the first value in a range must begin with str_ (and
            the second value may optionally begin with str_); if prefix_ is false,
            the second value in a range must end with str_ (and the first value
            may optionally end with str_).

            If str_ is empty then no prefix or suffix is checked for (and
            Xapian::RP_SUFFIX and Xapian::RP_REPEATED are irrelevant) - anything
            which looks like a date range will be processed.
            """
            _xapian.DateRangeProcessor_swiginit(self, _xapian.new_DateRangeProcessor(*args))
        __swig_destroy__ = _xapian.delete_DateRangeProcessor

    # Register DateRangeProcessor in _xapian:
    _xapian.DateRangeProcessor_swigregister(DateRangeProcessor)

    class NumberRangeProcessor(RangeProcessor):
        r"""

        Handle a number range.

        This class must be used on values which have been encoded using
        Xapian::sortable_serialise() which turns numbers into strings which
        will sort in the same order as the numbers (the same values can be
        used to implement a numeric sort).
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Constructor.

            Xapian::NumberRangeProcessor::NumberRangeProcessor(Xapian::valueno
            slot_, std::string_view str_={}, unsigned flags_=0)
            Xapian::NumberRangeProcessor::NumberRangeProcessor

            Parameters:
            -----------

            slot_:  The value slot number to query.

            str_:  A string to look for to recognise values as belonging to this
            numeric range.

            flags_:  Zero or more of the following flags, combined with bitwise-
            or: Xapian::RP_SUFFIX - require str_ as a suffix instead of a prefix.

            Xapian::RP_REPEATED - optionally allow str_ on both ends of the range
            - e.g. $1..$10 or 5m..50m. By default a prefix is only checked for on
            the start (e.g. date:1/1/1980..31/12/1989), and a suffix only on the
            end (e.g. 2..12kg).

            The string supplied in str_ is used by operator() to decide whether
            the pair of strings supplied to it constitute a valid range. If
            prefix_ is true, the first value in a range must begin with str_ (and
            the second value may optionally begin with str_); if prefix_ is false,
            the second value in a range must end with str_ (and the first value
            may optionally end with str_).

            If str_ is empty, the setting of prefix_ is irrelevant, and no special
            strings are required at the start or end of the strings defining the
            range.

            The remainder of both strings defining the endpoints must be valid
            floating point numbers. (FIXME: define format recognised).

            For example, if str_ is "$" and prefix_ is true, and the range
            processor has been added to the queryparser, the queryparser will
            accept "$10..50" or "$10..$50", but not "10..50" or "10..$50"
            as valid ranges. If str_ is "kg" and prefix_ is false, the
            queryparser will accept "10..50kg" or "10kg..50kg", but not
            "10..50" or "10kg..50" as valid ranges.
            """
            _xapian.NumberRangeProcessor_swiginit(self, _xapian.new_NumberRangeProcessor(*args))
        __swig_destroy__ = _xapian.delete_NumberRangeProcessor

    # Register NumberRangeProcessor in _xapian:
    _xapian.NumberRangeProcessor_swigregister(NumberRangeProcessor)

    class UnitRangeProcessor(RangeProcessor):
        r"""

        Handle a byte unit range.

        This class must be used on values which have been encoded using
        Xapian::sortable_serialise() which turns numbers into strings which
        will sort in the same order as the numbers (the same values can be
        used to implement a numeric sort).

        Added in Xapian 2.0.0.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Constructor.

            Xapian::UnitRangeProcessor::UnitRangeProcessor(Xapian::valueno slot_,
            std::string_view str_={})
            Xapian::UnitRangeProcessor::UnitRangeProcessor

            Parameters:
            -----------

            slot_:  The value slot number to query.

            str_:  A string to look for to recognise values as belonging to this
            numeric range.

            The string supplied in str_ is the prefix plus ":" that defines the
            field upon which the range query is performed.

            For example, if str_ is "size:", and the range processor has been
            added to the queryparser, the queryparser will accept "size:3K..10K"
            as a valid range.
            """
            _xapian.UnitRangeProcessor_swiginit(self, _xapian.new_UnitRangeProcessor(*args))
        __swig_destroy__ = _xapian.delete_UnitRangeProcessor

    # Register UnitRangeProcessor in _xapian:
    _xapian.UnitRangeProcessor_swigregister(UnitRangeProcessor)

    class FieldProcessor(object):
        r"""

        Base class for field processors.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor.

            Xapian::FieldProcessor::FieldProcessor()
            Xapian::FieldProcessor::FieldProcessor
            """
            if self.__class__ == FieldProcessor:
                _self = None
            else:
                _self = self
            _xapian.FieldProcessor_swiginit(self, _xapian.new_FieldProcessor(_self, ))
        __swig_destroy__ = _xapian.delete_FieldProcessor
        __call__ = _swig_new_instance_method(_xapian.FieldProcessor___call__)
        release = _swig_new_instance_method(_xapian.FieldProcessor_release)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_FieldProcessor(self)
            return weakref.proxy(self)

    # Register FieldProcessor in _xapian:
    _xapian.FieldProcessor_swigregister(FieldProcessor)

    class QueryParser(object):
        r"""

        Build a Xapian::Query object from a user query string.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        FLAG_BOOLEAN = _xapian.QueryParser_FLAG_BOOLEAN
        FLAG_PHRASE = _xapian.QueryParser_FLAG_PHRASE
        FLAG_LOVEHATE = _xapian.QueryParser_FLAG_LOVEHATE
        FLAG_BOOLEAN_ANY_CASE = _xapian.QueryParser_FLAG_BOOLEAN_ANY_CASE
        FLAG_WILDCARD = _xapian.QueryParser_FLAG_WILDCARD
        FLAG_PURE_NOT = _xapian.QueryParser_FLAG_PURE_NOT
        FLAG_PARTIAL = _xapian.QueryParser_FLAG_PARTIAL
        FLAG_SPELLING_CORRECTION = _xapian.QueryParser_FLAG_SPELLING_CORRECTION
        FLAG_SYNONYM = _xapian.QueryParser_FLAG_SYNONYM
        FLAG_AUTO_SYNONYMS = _xapian.QueryParser_FLAG_AUTO_SYNONYMS
        FLAG_AUTO_MULTIWORD_SYNONYMS = _xapian.QueryParser_FLAG_AUTO_MULTIWORD_SYNONYMS
        FLAG_NGRAMS = _xapian.QueryParser_FLAG_NGRAMS
        FLAG_CJK_NGRAM = _xapian.QueryParser_FLAG_CJK_NGRAM
        FLAG_WORD_BREAKS = _xapian.QueryParser_FLAG_WORD_BREAKS
        FLAG_WILDCARD_MULTI = _xapian.QueryParser_FLAG_WILDCARD_MULTI
        FLAG_WILDCARD_SINGLE = _xapian.QueryParser_FLAG_WILDCARD_SINGLE
        FLAG_WILDCARD_GLOB = _xapian.QueryParser_FLAG_WILDCARD_GLOB
        FLAG_FUZZY = _xapian.QueryParser_FLAG_FUZZY
        FLAG_ACCUMULATE = _xapian.QueryParser_FLAG_ACCUMULATE
        FLAG_NO_POSITIONS = _xapian.QueryParser_FLAG_NO_POSITIONS
        FLAG_NO_PROPER_NOUN_HEURISTIC = _xapian.QueryParser_FLAG_NO_PROPER_NOUN_HEURISTIC
        FLAG_DEFAULT = _xapian.QueryParser_FLAG_DEFAULT
        STEM_NONE = _xapian.QueryParser_STEM_NONE
        STEM_SOME = _xapian.QueryParser_STEM_SOME
        STEM_ALL = _xapian.QueryParser_STEM_ALL
        STEM_ALL_Z = _xapian.QueryParser_STEM_ALL_Z
        STEM_SOME_FULL_POS = _xapian.QueryParser_STEM_SOME_FULL_POS
        STOP_NONE = _xapian.QueryParser_STOP_NONE
        STOP_ALL = _xapian.QueryParser_STOP_ALL
        STOP_STEMMED = _xapian.QueryParser_STOP_STEMMED

        def __init__(self):
            r"""

            Default constructor.

            Xapian::QueryParser::QueryParser() Xapian::QueryParser::QueryParser
            """
            _xapian.QueryParser_swiginit(self, _xapian.new_QueryParser())
        __swig_destroy__ = _xapian.delete_QueryParser
        set_stemmer = _swig_new_instance_method(_xapian.QueryParser_set_stemmer)
        set_stemming_strategy = _swig_new_instance_method(_xapian.QueryParser_set_stemming_strategy)
        set_stopper = _swig_new_instance_method(_xapian.QueryParser_set_stopper)
        set_stopper_strategy = _swig_new_instance_method(_xapian.QueryParser_set_stopper_strategy)
        set_default_op = _swig_new_instance_method(_xapian.QueryParser_set_default_op)
        get_default_op = _swig_new_instance_method(_xapian.QueryParser_get_default_op)
        set_database = _swig_new_instance_method(_xapian.QueryParser_set_database)
        set_max_expansion = _swig_new_instance_method(_xapian.QueryParser_set_max_expansion)
        set_min_wildcard_prefix = _swig_new_instance_method(_xapian.QueryParser_set_min_wildcard_prefix)
        parse_query = _swig_new_instance_method(_xapian.QueryParser_parse_query)
        add_prefix = _swig_new_instance_method(_xapian.QueryParser_add_prefix)
        add_boolean_prefix = _swig_new_instance_method(_xapian.QueryParser_add_boolean_prefix)
        _stoplist_begin = _swig_new_instance_method(_xapian.QueryParser__stoplist_begin)
        _stoplist_end = _swig_new_instance_method(_xapian.QueryParser__stoplist_end)
        _unstem_begin = _swig_new_instance_method(_xapian.QueryParser__unstem_begin)
        _unstem_end = _swig_new_instance_method(_xapian.QueryParser__unstem_end)
        add_rangeprocessor = _swig_new_instance_method(_xapian.QueryParser_add_rangeprocessor)
        get_corrected_query_string = _swig_new_instance_method(_xapian.QueryParser_get_corrected_query_string)
        __str__ = _swig_new_instance_method(_xapian.QueryParser___str__)

    # Register QueryParser in _xapian:
    _xapian.QueryParser_swigregister(QueryParser)
    sortable_serialise = _xapian.sortable_serialise
    sortable_unserialise = _xapian.sortable_unserialise

    class ValueSetMatchDecider(MatchDecider):
        r"""

        MatchDecider filtering results based on whether document values are in
        a user- defined set.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, slot, inclusive_):
            r"""

            Construct a ValueSetMatchDecider.

            Xapian::ValueSetMatchDecider::ValueSetMatchDecider(Xapian::valueno
            slot, bool inclusive_)
            Xapian::ValueSetMatchDecider::ValueSetMatchDecider

            Parameters:
            -----------

            slot:  The value slot number to look in.

            inclusive_:  If true, match decider accepts documents which have a
            value in the specified slot which is a member of the test set; if
            false, match decider accepts documents which do not have a value in
            the specified slot.
            """
            _xapian.ValueSetMatchDecider_swiginit(self, _xapian.new_ValueSetMatchDecider(slot, inclusive_))
        add_value = _swig_new_instance_method(_xapian.ValueSetMatchDecider_add_value)
        remove_value = _swig_new_instance_method(_xapian.ValueSetMatchDecider_remove_value)
        __swig_destroy__ = _xapian.delete_ValueSetMatchDecider

    # Register ValueSetMatchDecider in _xapian:
    _xapian.ValueSetMatchDecider_swigregister(ValueSetMatchDecider)

    class Weight(object):
        r"""

        Abstract base class for weighting schemes.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined - class is abstract")
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_Weight
        name = _swig_new_instance_method(_xapian.Weight_name)
        get_sumpart = _swig_new_instance_method(_xapian.Weight_get_sumpart)
        get_maxpart = _swig_new_instance_method(_xapian.Weight_get_maxpart)
        get_sumextra = _swig_new_instance_method(_xapian.Weight_get_sumextra)
        get_maxextra = _swig_new_instance_method(_xapian.Weight_get_maxextra)
        create = _swig_new_static_method(_xapian.Weight_create)
        create_from_parameters = _swig_new_instance_method(_xapian.Weight_create_from_parameters)

    # Register Weight in _xapian:
    _xapian.Weight_swigregister(Weight)

    class BoolWeight(Weight):
        r"""

        Class implementing a "boolean" weighting scheme.

        This weighting scheme gives all documents zero weight.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Construct a BoolWeight.

            Xapian::BoolWeight::BoolWeight() Xapian::BoolWeight::BoolWeight
            """
            _xapian.BoolWeight_swiginit(self, _xapian.new_BoolWeight())
        create_from_parameters = _swig_new_instance_method(_xapian.BoolWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_BoolWeight

    # Register BoolWeight in _xapian:
    _xapian.BoolWeight_swigregister(BoolWeight)

    class TfIdfWeight(Weight):
        r"""

        Xapian::Weight subclass implementing the tf-idf weighting scheme.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        wdf_norm_NONE = _xapian.TfIdfWeight_wdf_norm_NONE
        wdf_norm_BOOLEAN = _xapian.TfIdfWeight_wdf_norm_BOOLEAN
        wdf_norm_SQUARE = _xapian.TfIdfWeight_wdf_norm_SQUARE
        wdf_norm_LOG = _xapian.TfIdfWeight_wdf_norm_LOG
        wdf_norm_PIVOTED = _xapian.TfIdfWeight_wdf_norm_PIVOTED
        wdf_norm_LOG_AVERAGE = _xapian.TfIdfWeight_wdf_norm_LOG_AVERAGE
        wdf_norm_AUG_LOG = _xapian.TfIdfWeight_wdf_norm_AUG_LOG
        wdf_norm_SQRT = _xapian.TfIdfWeight_wdf_norm_SQRT
        wdf_norm_AUG_AVERAGE = _xapian.TfIdfWeight_wdf_norm_AUG_AVERAGE
        wdf_norm_MAX = _xapian.TfIdfWeight_wdf_norm_MAX
        wdf_norm_AUG = _xapian.TfIdfWeight_wdf_norm_AUG
        idf_norm_NONE = _xapian.TfIdfWeight_idf_norm_NONE
        idf_norm_TFIDF = _xapian.TfIdfWeight_idf_norm_TFIDF
        idf_norm_SQUARE = _xapian.TfIdfWeight_idf_norm_SQUARE
        idf_norm_FREQ = _xapian.TfIdfWeight_idf_norm_FREQ
        idf_norm_PROB = _xapian.TfIdfWeight_idf_norm_PROB
        idf_norm_PIVOTED = _xapian.TfIdfWeight_idf_norm_PIVOTED
        idf_norm_GLOBAL_FREQ = _xapian.TfIdfWeight_idf_norm_GLOBAL_FREQ
        idf_norm_LOG_GLOBAL_FREQ = _xapian.TfIdfWeight_idf_norm_LOG_GLOBAL_FREQ
        idf_norm_INCREMENTED_GLOBAL_FREQ = _xapian.TfIdfWeight_idf_norm_INCREMENTED_GLOBAL_FREQ
        idf_norm_SQRT_GLOBAL_FREQ = _xapian.TfIdfWeight_idf_norm_SQRT_GLOBAL_FREQ
        wt_norm_NONE = _xapian.TfIdfWeight_wt_norm_NONE

        def __init__(self, *args):
            r"""

            Construct a TfIdfWeight using the default normalizations ("ntn").

            Xapian::TfIdfWeight::TfIdfWeight() Xapian::TfIdfWeight::TfIdfWeight
            """
            _xapian.TfIdfWeight_swiginit(self, _xapian.new_TfIdfWeight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.TfIdfWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_TfIdfWeight

    # Register TfIdfWeight in _xapian:
    _xapian.TfIdfWeight_swigregister(TfIdfWeight)

    class BM25Weight(Weight):
        r"""

        Xapian::Weight subclass implementing the BM25 probabilistic formula.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""Xapian::BM25Weight::BM25Weight() Xapian::BM25Weight::BM25Weight"""
            _xapian.BM25Weight_swiginit(self, _xapian.new_BM25Weight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.BM25Weight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_BM25Weight

    # Register BM25Weight in _xapian:
    _xapian.BM25Weight_swigregister(BM25Weight)

    class BM25PlusWeight(Weight):
        r"""

        Xapian::Weight subclass implementing the BM25+ probabilistic formula.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""
            Xapian::BM25PlusWeight::BM25PlusWeight()
            Xapian::BM25PlusWeight::BM25PlusWeight
            """
            _xapian.BM25PlusWeight_swiginit(self, _xapian.new_BM25PlusWeight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.BM25PlusWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_BM25PlusWeight

    # Register BM25PlusWeight in _xapian:
    _xapian.BM25PlusWeight_swigregister(BM25PlusWeight)

    class TradWeight(BM25Weight):
        r"""

        Xapian::Weight subclass implementing the traditional probabilistic
        formula.

        This class implements the "traditional" Probabilistic Weighting
        scheme, as described by the early papers on Probabilistic Retrieval.
        BM25 generally gives better results.

        TradWeight(k) is equivalent to BM25Weight(k, 0, 0, 1, 0), and since
        Xapian 2.0.0 TradWeight is actually implemented as a subclass of
        BM25Weight. In earlier versions is was a separate class which was
        equivalent except it returned weights (k+1) times smaller.

        Deprecated Use BM25Weight(k, 0, 0, 1, 0) instead.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, k=1.0):
            r"""

            Construct a TradWeight.

            Xapian::TradWeight::TradWeight(double k=1.0)
            Xapian::TradWeight::TradWeight

            Parameters:
            -----------

            k:  A non-negative parameter controlling how influential within-
            document- frequency (wdf) and document length are. k=0 means that wdf
            and document length don't affect the weights. The larger k is, the
            more they do. (default 1)
            """
            _xapian.TradWeight_swiginit(self, _xapian.new_TradWeight(k))
        __swig_destroy__ = _xapian.delete_TradWeight

    # Register TradWeight in _xapian:
    _xapian.TradWeight_swigregister(TradWeight)

    class InL2Weight(Weight):
        r"""

        This class implements the InL2 weighting scheme.

        InL2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        This weighting scheme is useful for tasks that require early
        precision.

        It uses the Inverse document frequency model (In), the Laplace method
        to find the aftereffect of sampling (L) and the second wdf
        normalization proposed by Amati to normalize the wdf in the document
        to the length of the document (H2).

        For more information about the DFR Framework and the InL2 scheme,
        please refer to: Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""Xapian::InL2Weight::InL2Weight() Xapian::InL2Weight::InL2Weight"""
            _xapian.InL2Weight_swiginit(self, _xapian.new_InL2Weight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.InL2Weight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_InL2Weight

    # Register InL2Weight in _xapian:
    _xapian.InL2Weight_swigregister(InL2Weight)

    class IfB2Weight(Weight):
        r"""

        This class implements the IfB2 weighting scheme.

        IfB2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        It uses the Inverse term frequency model (If), the Bernoulli method to
        find the aftereffect of sampling (B) and the second wdf normalization
        proposed by Amati to normalize the wdf in the document to the length
        of the document (H2).

        For more information about the DFR Framework and the IfB2 scheme,
        please refer to: Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""Xapian::IfB2Weight::IfB2Weight() Xapian::IfB2Weight::IfB2Weight"""
            _xapian.IfB2Weight_swiginit(self, _xapian.new_IfB2Weight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.IfB2Weight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_IfB2Weight

    # Register IfB2Weight in _xapian:
    _xapian.IfB2Weight_swigregister(IfB2Weight)

    class IneB2Weight(Weight):
        r"""

        This class implements the IneB2 weighting scheme.

        IneB2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        It uses the Inverse expected document frequency model (Ine), the
        Bernoulli method to find the aftereffect of sampling (B) and the
        second wdf normalization proposed by Amati to normalize the wdf in the
        document to the length of the document (H2).

        For more information about the DFR Framework and the IneB2 scheme,
        please refer to: Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""Xapian::IneB2Weight::IneB2Weight() Xapian::IneB2Weight::IneB2Weight"""
            _xapian.IneB2Weight_swiginit(self, _xapian.new_IneB2Weight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.IneB2Weight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_IneB2Weight

    # Register IneB2Weight in _xapian:
    _xapian.IneB2Weight_swigregister(IneB2Weight)

    class BB2Weight(Weight):
        r"""

        This class implements the BB2 weighting scheme.

        BB2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        It uses the Bose-Einstein probabilistic distribution (B) along with
        Stirling's power approximation, the Bernoulli method to find the
        aftereffect of sampling (B) and the second wdf normalization proposed
        by Amati to normalize the wdf in the document to the length of the
        document (H2).

        For more information about the DFR Framework and the BB2 scheme,
        please refer to : Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""Xapian::BB2Weight::BB2Weight() Xapian::BB2Weight::BB2Weight"""
            _xapian.BB2Weight_swiginit(self, _xapian.new_BB2Weight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.BB2Weight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_BB2Weight

    # Register BB2Weight in _xapian:
    _xapian.BB2Weight_swigregister(BB2Weight)

    class DLHWeight(Weight):
        r"""

        This class implements the DLH weighting scheme, which is a
        representative scheme of the Divergence from Randomness Framework by
        Gianni Amati.

        This is a parameter free weighting scheme and it should be used with
        query expansion to obtain better results. It uses the HyperGeometric
        Probabilistic model and Laplace's normalization to calculate the risk
        gain.

        For more information about the DFR Framework and the DLH scheme,
        please refer to : a.) Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389. b.) FUB, IASI-CNR and University of
        Tor Vergata at TREC 2007 Blog Track. G. Amati and E. Ambrosi and M.
        Bianchi and C. Gaibisso and G. Gambosi. Proceedings of the 16th Text
        REtrieval Conference (TREC-2007), 2008.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""Xapian::DLHWeight::DLHWeight() Xapian::DLHWeight::DLHWeight"""
            _xapian.DLHWeight_swiginit(self, _xapian.new_DLHWeight())
        create_from_parameters = _swig_new_instance_method(_xapian.DLHWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_DLHWeight

    # Register DLHWeight in _xapian:
    _xapian.DLHWeight_swigregister(DLHWeight)

    class PL2Weight(Weight):
        r"""

        This class implements the PL2 weighting scheme.

        PL2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        This weighting scheme is useful for tasks that require early
        precision.

        It uses the Poisson approximation of the Binomial Probabilistic
        distribution (P) along with Stirling's approximation for the factorial
        value, the Laplace method to find the aftereffect of sampling (L) and
        the second wdf normalization proposed by Amati to normalize the wdf in
        the document to the length of the document (H2).

        For more information about the DFR Framework and the PL2 scheme,
        please refer to : Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""Xapian::PL2Weight::PL2Weight() Xapian::PL2Weight::PL2Weight"""
            _xapian.PL2Weight_swiginit(self, _xapian.new_PL2Weight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.PL2Weight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_PL2Weight

    # Register PL2Weight in _xapian:
    _xapian.PL2Weight_swigregister(PL2Weight)

    class PL2PlusWeight(Weight):
        r"""

        Xapian::Weight subclass implementing the PL2+ probabilistic formula.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""
            Xapian::PL2PlusWeight::PL2PlusWeight()
            Xapian::PL2PlusWeight::PL2PlusWeight
            """
            _xapian.PL2PlusWeight_swiginit(self, _xapian.new_PL2PlusWeight(*args))
        create_from_parameters = _swig_new_instance_method(_xapian.PL2PlusWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_PL2PlusWeight

    # Register PL2PlusWeight in _xapian:
    _xapian.PL2PlusWeight_swigregister(PL2PlusWeight)

    class DPHWeight(Weight):
        r"""

        This class implements the DPH weighting scheme.

        DPH is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        This is a parameter free weighting scheme and it should be used with
        query expansion to obtain better results. It uses the HyperGeometric
        Probabilistic model and Popper's normalization to calculate the risk
        gain.

        For more information about the DFR Framework and the DPH scheme,
        please refer to : a.) Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389. b.) FUB, IASI-CNR and University of
        Tor Vergata at TREC 2007 Blog Track. G. Amati and E. Ambrosi and M.
        Bianchi and C. Gaibisso and G. Gambosi. Proceedings of the 16th Text
        Retrieval Conference (TREC-2007), 2008.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Construct a DPHWeight.

            Xapian::DPHWeight::DPHWeight() Xapian::DPHWeight::DPHWeight
            """
            _xapian.DPHWeight_swiginit(self, _xapian.new_DPHWeight())
        create_from_parameters = _swig_new_instance_method(_xapian.DPHWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_DPHWeight

    # Register DPHWeight in _xapian:
    _xapian.DPHWeight_swigregister(DPHWeight)

    class LMJMWeight(Weight):
        r"""

        Language Model weighting with Jelinek-Mercer smoothing.

        As described in:

        Zhai, C., & Lafferty, J.D. (2004). A study of smoothing methods for
        language models applied to information retrieval. ACM Trans. Inf.
        Syst., 22, 179-214.

        2.0.0
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, _lambda=0.0):
            r"""

            Construct a LMJMWeight.

            Xapian::LMJMWeight::LMJMWeight(double lambda=0.0)
            Xapian::LMJMWeight::LMJMWeight

            Parameters:
            -----------

            lambda:  A parameter strictly between 0 and 1 which linearly
            interpolates between the maximum likelihood model (the limit as λ→0)
            and the collection model (the limit as λ→1).

            Values of λ around 0.1 are apparently optimal for short queries and
            around 0.7 for long queries. If lambda is out of range (i.e. <= 0 or
            >= 1) then the λ value used is chosen dynamically based on the query
            length using the formula:

            (query_length - 1) / 10.0

            The result is clamped to 0.1 for query_length <= 2, and to 0.7 for
            query_length >= 8.
            """
            _xapian.LMJMWeight_swiginit(self, _xapian.new_LMJMWeight(_lambda))
        create_from_parameters = _swig_new_instance_method(_xapian.LMJMWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_LMJMWeight

    # Register LMJMWeight in _xapian:
    _xapian.LMJMWeight_swigregister(LMJMWeight)

    class LMDirichletWeight(Weight):
        r"""

        Language Model weighting with Dirichlet or Dir+ smoothing.

        Dirichlet smoothing is as described in:

        Zhai, C., & Lafferty, J.D. (2004). A study of smoothing methods for
        language models applied to information retrieval. ACM Trans. Inf.
        Syst., 22, 179-214.

        Dir+ is described in:

        Lv, Y., & Zhai, C. (2011). Lower-bounding term frequency
        normalization. International Conference on Information and Knowledge
        Management.

        2.0.0
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, mu=2000.0, delta=0.05):
            r"""

            Construct a LMDirichletWeight.

            Xapian::LMDirichletWeight::LMDirichletWeight(double mu=2000.0, double
            delta=0.05) Xapian::LMDirichletWeight::LMDirichletWeight

            Parameters:
            -----------

            mu:  A parameter which is > 0. Default: 2000

            delta:  A parameter which is >= 0, which is "a pseudo [wdf] value to
            control the scale of the [wdf] lower bound". If this parameter is >
            0, then the smoothing is Dir+; if it's zero, it's Dirichlet. Default:
            0.05
            """
            _xapian.LMDirichletWeight_swiginit(self, _xapian.new_LMDirichletWeight(mu, delta))
        create_from_parameters = _swig_new_instance_method(_xapian.LMDirichletWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_LMDirichletWeight

    # Register LMDirichletWeight in _xapian:
    _xapian.LMDirichletWeight_swigregister(LMDirichletWeight)

    class LMAbsDiscountWeight(Weight):
        r"""

        Language Model weighting with Absolute Discount smoothing.

        As described in:

        Zhai, C., & Lafferty, J.D. (2004). A study of smoothing methods for
        language models applied to information retrieval. ACM Trans. Inf.
        Syst., 22, 179-214.

        2.0.0
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, delta=0.7):
            r"""

            Construct a LMAbsDiscountWeight.

            Xapian::LMAbsDiscountWeight::LMAbsDiscountWeight(double delta=0.7)
            Xapian::LMAbsDiscountWeight::LMAbsDiscountWeight

            Parameters:
            -----------

            delta:  A parameter between 0 and 1. Default: 0.7
            """
            _xapian.LMAbsDiscountWeight_swiginit(self, _xapian.new_LMAbsDiscountWeight(delta))
        create_from_parameters = _swig_new_instance_method(_xapian.LMAbsDiscountWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_LMAbsDiscountWeight

    # Register LMAbsDiscountWeight in _xapian:
    _xapian.LMAbsDiscountWeight_swigregister(LMAbsDiscountWeight)

    class LM2StageWeight(Weight):
        r"""

        Language Model weighting with Two Stage smoothing.

        As described in:

        Zhai, C., & Lafferty, J.D. (2004). A study of smoothing methods for
        language models applied to information retrieval. ACM Trans. Inf.
        Syst., 22, 179-214.

        2.0.0
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, _lambda=0.7, mu=2000.0):
            r"""

            Construct a LM2StageWeight.

            Xapian::LM2StageWeight::LM2StageWeight(double lambda=0.7, double
            mu=2000.0) Xapian::LM2StageWeight::LM2StageWeight

            Parameters:
            -----------

            lambda:  A parameter between 0 and 1 which linearly interpolates
            between the maximum likelihood model (at 0) and the collection model
            (at 1). Default: 0.7

            mu:  A parameter which is greater than 0. Default: 2000
            """
            _xapian.LM2StageWeight_swiginit(self, _xapian.new_LM2StageWeight(_lambda, mu))
        create_from_parameters = _swig_new_instance_method(_xapian.LM2StageWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_LM2StageWeight

    # Register LM2StageWeight in _xapian:
    _xapian.LM2StageWeight_swigregister(LM2StageWeight)

    class CoordWeight(Weight):
        r"""

        Xapian::Weight subclass implementing Coordinate Matching.

        Each matching term scores one point. See Managing Gigabytes, Second
        Edition p181.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        init = _swig_new_instance_method(_xapian.CoordWeight_init)

        def __init__(self):
            r"""

            Construct a CoordWeight.

            Xapian::CoordWeight::CoordWeight() Xapian::CoordWeight::CoordWeight
            """
            _xapian.CoordWeight_swiginit(self, _xapian.new_CoordWeight())
        create_from_parameters = _swig_new_instance_method(_xapian.CoordWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_CoordWeight

    # Register CoordWeight in _xapian:
    _xapian.CoordWeight_swigregister(CoordWeight)

    class DiceWeight(Weight):
        r"""

        Xapian::Weight subclass implementing Dice Coefficient.

        The Dice Coefficient measures the degree of similarity between pairs
        of sets (in Xapian, these sets are words in a document and words in a
        query).

        https://en.wikipedia.org/wiki/Dice-S%C3%B8rensen_coefficient

        (It's named after Lee Raymond Dice rather than after cubes or other
        polyhedra with numbered sides which are rolled to generate random
        numbers in games.)

        Ranking by the Dice Coefficient is the same ranking by the Jaccard
        coefficient since you can calculate Jaccard coefficient J from Dice
        coefficient D using equation J = D / (2 - D) which is a monotonic for
        the range [0,1] (the range of possible Dice coefficient values).

        2.0.0
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Construct a DiceWeight.

            Xapian::DiceWeight::DiceWeight() Xapian::DiceWeight::DiceWeight
            """
            _xapian.DiceWeight_swiginit(self, _xapian.new_DiceWeight())
        create_from_parameters = _swig_new_instance_method(_xapian.DiceWeight_create_from_parameters)
        __swig_destroy__ = _xapian.delete_DiceWeight

    # Register DiceWeight in _xapian:
    _xapian.DiceWeight_swigregister(DiceWeight)

    class Compactor(object):
        r"""

        Compact a database, or merge and compact several.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        STANDARD = _xapian.Compactor_STANDARD
        FULL = _xapian.Compactor_FULL
        FULLER = _xapian.Compactor_FULLER

        def __init__(self):
            r"""Xapian::Compactor::Compactor() Xapian::Compactor::Compactor"""
            if self.__class__ == Compactor:
                _self = None
            else:
                _self = self
            _xapian.Compactor_swiginit(self, _xapian.new_Compactor(_self, ))
        __swig_destroy__ = _xapian.delete_Compactor
        set_status = _swig_new_instance_method(_xapian.Compactor_set_status)
        resolve_duplicate_metadata = _swig_new_instance_method(_xapian.Compactor_resolve_duplicate_metadata)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_Compactor(self)
            return weakref.proxy(self)

    # Register Compactor in _xapian:
    _xapian.Compactor_swigregister(Compactor)

    class PostingSource(object):
        r"""

        Base class which provides an "external" source of postings.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Allow subclasses to be instantiated.

            Xapian::PostingSource::PostingSource() noexcept
            Xapian::PostingSource::PostingSource
            """
            if self.__class__ == PostingSource:
                _self = None
            else:
                _self = self
            _xapian.PostingSource_swiginit(self, _xapian.new_PostingSource(_self, ))
        __swig_destroy__ = _xapian.delete_PostingSource
        get_termfreq_min = _swig_new_instance_method(_xapian.PostingSource_get_termfreq_min)
        get_termfreq_est = _swig_new_instance_method(_xapian.PostingSource_get_termfreq_est)
        get_termfreq_max = _swig_new_instance_method(_xapian.PostingSource_get_termfreq_max)
        set_maxweight = _swig_new_instance_method(_xapian.PostingSource_set_maxweight)
        get_maxweight = _swig_new_instance_method(_xapian.PostingSource_get_maxweight)
        get_weight = _swig_new_instance_method(_xapian.PostingSource_get_weight)
        get_docid = _swig_new_instance_method(_xapian.PostingSource_get_docid)
        __next__ = _swig_new_instance_method(_xapian.PostingSource___next__)
        skip_to = _swig_new_instance_method(_xapian.PostingSource_skip_to)
        check = _swig_new_instance_method(_xapian.PostingSource_check)
        at_end = _swig_new_instance_method(_xapian.PostingSource_at_end)
        name = _swig_new_instance_method(_xapian.PostingSource_name)
        reset = _swig_new_instance_method(_xapian.PostingSource_reset)
        init = _swig_new_instance_method(_xapian.PostingSource_init)
        __str__ = _swig_new_instance_method(_xapian.PostingSource___str__)
        release = _swig_new_instance_method(_xapian.PostingSource_release)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_PostingSource(self)
            return weakref.proxy(self)

    # Register PostingSource in _xapian:
    _xapian.PostingSource_swigregister(PostingSource)

    class ValuePostingSource(PostingSource):
        r"""

        A posting source which generates weights from a value slot.

        This is a base class for classes which generate weights using values
        stored in the specified slot. For example, ValueWeightPostingSource
        uses sortable_unserialise to convert values directly to weights.

        The upper bound on the weight returned is set to DBL_MAX. Subclasses
        should call set_maxweight() in their init() methods after calling
        ValuePostingSource::init() if they know a tighter bound on the weight.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, slot_):
            r"""

            Construct a ValuePostingSource.

            Xapian::ValuePostingSource::ValuePostingSource(Xapian::valueno slot_)
            noexcept Xapian::ValuePostingSource::ValuePostingSource

            Parameters:
            -----------

            slot_:  The value slot to read values from.
            """
            if self.__class__ == ValuePostingSource:
                _self = None
            else:
                _self = self
            _xapian.ValuePostingSource_swiginit(self, _xapian.new_ValuePostingSource(_self, slot_))
        get_termfreq_min = _swig_new_instance_method(_xapian.ValuePostingSource_get_termfreq_min)
        get_termfreq_est = _swig_new_instance_method(_xapian.ValuePostingSource_get_termfreq_est)
        get_termfreq_max = _swig_new_instance_method(_xapian.ValuePostingSource_get_termfreq_max)
        __next__ = _swig_new_instance_method(_xapian.ValuePostingSource___next__)
        skip_to = _swig_new_instance_method(_xapian.ValuePostingSource_skip_to)
        check = _swig_new_instance_method(_xapian.ValuePostingSource_check)
        at_end = _swig_new_instance_method(_xapian.ValuePostingSource_at_end)
        get_docid = _swig_new_instance_method(_xapian.ValuePostingSource_get_docid)
        reset = _swig_new_instance_method(_xapian.ValuePostingSource_reset)
        get_database = _swig_new_instance_method(_xapian.ValuePostingSource_get_database)
        get_slot = _swig_new_instance_method(_xapian.ValuePostingSource_get_slot)
        get_value = _swig_new_instance_method(_xapian.ValuePostingSource_get_value)
        done = _swig_new_instance_method(_xapian.ValuePostingSource_done)
        get_started = _swig_new_instance_method(_xapian.ValuePostingSource_get_started)
        set_termfreq_min = _swig_new_instance_method(_xapian.ValuePostingSource_set_termfreq_min)
        set_termfreq_est = _swig_new_instance_method(_xapian.ValuePostingSource_set_termfreq_est)
        set_termfreq_max = _swig_new_instance_method(_xapian.ValuePostingSource_set_termfreq_max)
        __str__ = _swig_new_instance_method(_xapian.ValuePostingSource___str__)
        __swig_destroy__ = _xapian.delete_ValuePostingSource
        def __disown__(self):
            self.this.disown()
            _xapian.disown_ValuePostingSource(self)
            return weakref.proxy(self)

    # Register ValuePostingSource in _xapian:
    _xapian.ValuePostingSource_swigregister(ValuePostingSource)

    class ValueWeightPostingSource(ValuePostingSource):
        r"""

        A posting source which reads weights from a value slot.

        This returns entries for all documents in the given database which
        have a non empty values in the specified slot. It returns a weight
        calculated by applying sortable_unserialise to the value stored in the
        slot (so the values stored should probably have been calculated by
        applying sortable_serialise to a floating point number at index time).

        The upper bound on the weight returned is set using the upper bound on
        the values in the specified slot, or DBL_MAX if value bounds aren't
        supported by the current backend.

        For efficiency, this posting source doesn't check that the stored
        values are valid in any way, so it will never raise an exception due
        to invalid stored values. In particular, it doesn't ensure that the
        unserialised values are positive, which is a requirement for weights.
        The behaviour if the slot contains values which unserialise to
        negative values is undefined.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, slot_):
            r"""

            Construct a ValueWeightPostingSource.

            Xapian::ValueWeightPostingSource::ValueWeightPostingSource(Xapian::valueno
            slot_) Xapian::ValueWeightPostingSource::ValueWeightPostingSource

            Parameters:
            -----------

            slot_:  The value slot to read values from.
            """
            if self.__class__ == ValueWeightPostingSource:
                _self = None
            else:
                _self = self
            _xapian.ValueWeightPostingSource_swiginit(self, _xapian.new_ValueWeightPostingSource(_self, slot_))
        get_weight = _swig_new_instance_method(_xapian.ValueWeightPostingSource_get_weight)
        name = _swig_new_instance_method(_xapian.ValueWeightPostingSource_name)
        reset = _swig_new_instance_method(_xapian.ValueWeightPostingSource_reset)
        __str__ = _swig_new_instance_method(_xapian.ValueWeightPostingSource___str__)
        __swig_destroy__ = _xapian.delete_ValueWeightPostingSource
        def __disown__(self):
            self.this.disown()
            _xapian.disown_ValueWeightPostingSource(self)
            return weakref.proxy(self)

    # Register ValueWeightPostingSource in _xapian:
    _xapian.ValueWeightPostingSource_swigregister(ValueWeightPostingSource)

    class DecreasingValueWeightPostingSource(ValueWeightPostingSource):
        r"""

        Read weights from a value which is known to decrease as docid
        increases.

        This posting source can be used, like ValueWeightPostingSource, to add
        a weight contribution to a query based on the values stored in a slot.
        The values in the slot must be serialised as by  sortable_serialise().

        However, this posting source is additionally given an inclusive range
        of document IDs within which the weight is known to be decreasing, so
        if documents in this range have IDs A and B and B > A then weight of B
        <= weight of A. This can allow the posting source to skip to the end
        of the range quickly if insufficient weight is left in the posting
        source for a particular query to match.

        By default, the range is assumed to cover all document IDs.

        The ordering property would typically be arranged at index time by
        controlling the order that documents are indexed in.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, slot_, range_start_=0, range_end_=0):
            r"""

            Construct a DecreasingValueWeightPostingSource.

            Xapian::DecreasingValueWeightPostingSource::DecreasingValueWeightPostingSource(Xapian::valueno
            slot_, Xapian::docid range_start_=0, Xapian::docid range_end_=0)
            Xapian::DecreasingValueWeightPostingSource::DecreasingValueWeightPosti
            ngSource

            Parameters:
            -----------

            slot_:  The value slot to read values from.

            range_start_:  Start of range of docids for which weights are known to
            be decreasing (default: first docid)

            range_end_:  End of range of docids for which weights are known to be
            decreasing (default: last docid)
            """
            _xapian.DecreasingValueWeightPostingSource_swiginit(self, _xapian.new_DecreasingValueWeightPostingSource(slot_, range_start_, range_end_))
        __swig_destroy__ = _xapian.delete_DecreasingValueWeightPostingSource

    # Register DecreasingValueWeightPostingSource in _xapian:
    _xapian.DecreasingValueWeightPostingSource_swigregister(DecreasingValueWeightPostingSource)

    class ValueMapPostingSource(ValuePostingSource):
        r"""

        A posting source which looks up weights in a map using values as the
        key.

        This allows will return entries for all documents in the given
        database which have a value in the slot specified. The values will be
        mapped to the corresponding weight in the weight map. If there is no
        mapping for a particular value, the default weight will be returned
        (which itself defaults to 0.0).
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, slot_):
            r"""

            Construct a ValueMapPostingSource.

            Xapian::ValueMapPostingSource::ValueMapPostingSource(Xapian::valueno
            slot_) Xapian::ValueMapPostingSource::ValueMapPostingSource

            Parameters:
            -----------

            slot_:  The value slot to read values from.
            """
            _xapian.ValueMapPostingSource_swiginit(self, _xapian.new_ValueMapPostingSource(slot_))
        add_mapping = _swig_new_instance_method(_xapian.ValueMapPostingSource_add_mapping)
        clear_mappings = _swig_new_instance_method(_xapian.ValueMapPostingSource_clear_mappings)
        set_default_weight = _swig_new_instance_method(_xapian.ValueMapPostingSource_set_default_weight)
        __swig_destroy__ = _xapian.delete_ValueMapPostingSource

    # Register ValueMapPostingSource in _xapian:
    _xapian.ValueMapPostingSource_swigregister(ValueMapPostingSource)

    class FixedWeightPostingSource(PostingSource):
        r"""

        A posting source which returns a fixed weight for all documents.

        This returns entries for all documents in the given database, with a
        fixed weight (specified by a parameter to the constructor). This can
        be used to boost a sub-query by OP_AND-ing a FixedWeightPostingSource
        with that sub-query - this OP_AND will match the same documents as the
        sub-query does, but documents matching the subquery will get the
        specified extra weight contribution.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, wt):
            r"""

            Construct a FixedWeightPostingSource.

            Xapian::FixedWeightPostingSource::FixedWeightPostingSource(double wt)
            Xapian::FixedWeightPostingSource::FixedWeightPostingSource

            Parameters:
            -----------

            wt:  The fixed weight to return.
            """
            _xapian.FixedWeightPostingSource_swiginit(self, _xapian.new_FixedWeightPostingSource(wt))
        __swig_destroy__ = _xapian.delete_FixedWeightPostingSource

    # Register FixedWeightPostingSource in _xapian:
    _xapian.FixedWeightPostingSource_swigregister(FixedWeightPostingSource)

    class MatchSpy(object):
        r"""

        Abstract base class for match spies.

        The subclasses will generally accumulate information seen during the
        match, to calculate aggregate functions, or other profiles of the
        matching documents.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor, needed by subclass constructors.

            Xapian::MatchSpy::MatchSpy() noexcept Xapian::MatchSpy::MatchSpy
            """
            if self.__class__ == MatchSpy:
                _self = None
            else:
                _self = self
            _xapian.MatchSpy_swiginit(self, _xapian.new_MatchSpy(_self, ))
        __swig_destroy__ = _xapian.delete_MatchSpy
        __call__ = _swig_new_instance_method(_xapian.MatchSpy___call__)
        name = _swig_new_instance_method(_xapian.MatchSpy_name)
        merge_results = _swig_new_instance_method(_xapian.MatchSpy_merge_results)
        __str__ = _swig_new_instance_method(_xapian.MatchSpy___str__)
        release = _swig_new_instance_method(_xapian.MatchSpy_release)
        def __disown__(self):
            self.this.disown()
            _xapian.disown_MatchSpy(self)
            return weakref.proxy(self)

    # Register MatchSpy in _xapian:
    _xapian.MatchSpy_swigregister(MatchSpy)

    class ValueCountMatchSpy(MatchSpy):
        r"""

        Class for counting the frequencies of values in the matching
        documents.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct a MatchSpy which counts the values in a particular slot.

            Xapian::ValueCountMatchSpy::ValueCountMatchSpy(Xapian::valueno slot_)
            Xapian::ValueCountMatchSpy::ValueCountMatchSpy
            """
            _xapian.ValueCountMatchSpy_swiginit(self, _xapian.new_ValueCountMatchSpy(*args))
        get_total = _swig_new_instance_method(_xapian.ValueCountMatchSpy_get_total)
        values_begin = _swig_new_instance_method(_xapian.ValueCountMatchSpy_values_begin)
        values_end = _swig_new_instance_method(_xapian.ValueCountMatchSpy_values_end)
        top_values_begin = _swig_new_instance_method(_xapian.ValueCountMatchSpy_top_values_begin)
        top_values_end = _swig_new_instance_method(_xapian.ValueCountMatchSpy_top_values_end)
        __swig_destroy__ = _xapian.delete_ValueCountMatchSpy

    # Register ValueCountMatchSpy in _xapian:
    _xapian.ValueCountMatchSpy_swigregister(ValueCountMatchSpy)
    miles_to_metres = _xapian.miles_to_metres
    metres_to_miles = _xapian.metres_to_miles

    class LatLongCoord(object):
        r"""

        A latitude-longitude coordinate.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features

        Note that latitude-longitude coordinates are only precisely meaningful
        if the datum used to define them is specified. This class ignores this
        issue - it is up to the caller to ensure that the datum used for each
        coordinate in a system is consistent.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        latitude = property(_xapian.LatLongCoord_latitude_get, _xapian.LatLongCoord_latitude_set)
        longitude = property(_xapian.LatLongCoord_longitude_get, _xapian.LatLongCoord_longitude_set)

        def __init__(self, *args):
            r"""

            Construct a coordinate.

            Xapian::LatLongCoord::LatLongCoord(double latitude_, double
            longitude_) Xapian::LatLongCoord::LatLongCoord If the supplied
            longitude is out of the standard range, it will be normalised to the
            range 0 <= longitude < 360.

            If you want to avoid the checks (for example, you know that your
            values are already in range), you can use the alternate constructor to
            construct an uninitialised coordinate, and then set the latitude and
            longitude directly.

            Parameters:
            -----------

            InvalidArgumentError:  the supplied latitude is out of range.
            """
            _xapian.LatLongCoord_swiginit(self, _xapian.new_LatLongCoord(*args))
        unserialise = _swig_new_instance_method(_xapian.LatLongCoord_unserialise)
        serialise = _swig_new_instance_method(_xapian.LatLongCoord_serialise)
        __str__ = _swig_new_instance_method(_xapian.LatLongCoord___str__)
        __swig_destroy__ = _xapian.delete_LatLongCoord

    # Register LatLongCoord in _xapian:
    _xapian.LatLongCoord_swigregister(LatLongCoord)
    class LatLongCoordsIterator(object):
        r"""

        An iterator across the values in a LatLongCoords object.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self):
            r"""

            Default constructor. Produces an uninitialised iterator.

            Xapian::LatLongCoordsIterator::LatLongCoordsIterator()
            Xapian::LatLongCoordsIterator::LatLongCoordsIterator
            """
            _xapian.LatLongCoordsIterator_swiginit(self, _xapian.new_LatLongCoordsIterator())
        __eq__ = _swig_new_instance_method(_xapian.LatLongCoordsIterator___eq__)
        equals = _swig_new_instance_method(_xapian.LatLongCoordsIterator_equals)
        get_coord = _swig_new_instance_method(_xapian.LatLongCoordsIterator_get_coord)
        __next__ = _swig_new_instance_method(_xapian.LatLongCoordsIterator___next__)
        __swig_destroy__ = _xapian.delete_LatLongCoordsIterator

    # Register LatLongCoordsIterator in _xapian:
    _xapian.LatLongCoordsIterator_swigregister(LatLongCoordsIterator)

    class LatLongCoords(object):
        r"""

        A sequence of latitude-longitude coordinates.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        begin = _swig_new_instance_method(_xapian.LatLongCoords_begin)
        end = _swig_new_instance_method(_xapian.LatLongCoords_end)
        size = _swig_new_instance_method(_xapian.LatLongCoords_size)
        empty = _swig_new_instance_method(_xapian.LatLongCoords_empty)
        append = _swig_new_instance_method(_xapian.LatLongCoords_append)

        def __init__(self, *args):
            r"""

            Construct a container holding one coordinate.

            Xapian::LatLongCoords::LatLongCoords(const LatLongCoord &coord)
            Xapian::LatLongCoords::LatLongCoords
            """
            _xapian.LatLongCoords_swiginit(self, _xapian.new_LatLongCoords(*args))
        unserialise = _swig_new_instance_method(_xapian.LatLongCoords_unserialise)
        serialise = _swig_new_instance_method(_xapian.LatLongCoords_serialise)
        __str__ = _swig_new_instance_method(_xapian.LatLongCoords___str__)
        __swig_destroy__ = _xapian.delete_LatLongCoords

    # Register LatLongCoords in _xapian:
    _xapian.LatLongCoords_swigregister(LatLongCoords)
    __ne__ = _xapian.__ne__

    class LatLongMetric(object):
        r"""

        Base class for calculating distances between two lat/long coordinates.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_LatLongMetric
        pointwise_distance = _swig_new_instance_method(_xapian.LatLongMetric_pointwise_distance)
        __call__ = _swig_new_instance_method(_xapian.LatLongMetric___call__)
        name = _swig_new_instance_method(_xapian.LatLongMetric_name)

        def __init__(self):
            if self.__class__ == LatLongMetric:
                _self = None
            else:
                _self = self
            _xapian.LatLongMetric_swiginit(self, _xapian.new_LatLongMetric(_self, ))
        def __disown__(self):
            self.this.disown()
            _xapian.disown_LatLongMetric(self)
            return weakref.proxy(self)

    # Register LatLongMetric in _xapian:
    _xapian.LatLongMetric_swigregister(LatLongMetric)

    class GreatCircleMetric(LatLongMetric):
        r"""

        Calculate the great-circle distance between two coordinates on a
        sphere.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features

        This uses the haversine formula to calculate the distance. Note that
        this formula is subject to inaccuracy due to numerical errors for
        coordinates on the opposite side of the sphere.

        Seehttps://en.wikipedia.org/wiki/Haversine_formula
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct a GreatCircleMetric using a specified radius.

            Xapian::GreatCircleMetric::GreatCircleMetric(double radius_)
            Xapian::GreatCircleMetric::GreatCircleMetric This is useful for data
            sets in which the points are not on Earth (eg, a database of features
            on Mars).

            Parameters:
            -----------

            radius_:  The radius of the sphere to use, in metres.
            """
            _xapian.GreatCircleMetric_swiginit(self, _xapian.new_GreatCircleMetric(*args))
        __swig_destroy__ = _xapian.delete_GreatCircleMetric

    # Register GreatCircleMetric in _xapian:
    _xapian.GreatCircleMetric_swigregister(GreatCircleMetric)

    class LatLongDistancePostingSource(ValuePostingSource):
        r"""

        Posting source which returns a weight based on geospatial distance.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features

        Results are weighted by the distance from a fixed point, or list of
        points, calculated according to the metric supplied. If multiple
        points are supplied (either in the constructor, or in the coordinates
        stored in a document), the closest pointwise distance is used.

        Documents further away than a specified maximum range (or with no
        location stored in the specified slot) will not be returned.

        The weight returned is computed from the distance using the formula:

        k1 * pow(distance + k1, -k2)

        (Where k1 and k2 are (strictly) positive, floating point constants,
        which default to 1000 and 1, respectively. Distance is measured in
        metres, so this means that something at the centre gets a weight of
        1.0, something 1km away gets a weight of 0.5, and something 3km away
        gets a weight of 0.25, etc)
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct a new posting source which returns only documents within
            range of one of the central coordinates.

            Xapian::LatLongDistancePostingSource::LatLongDistancePostingSource(Xapian::valueno
            slot_, const LatLongCoords &centre_, double max_range_=0.0, double
            k1_=1000.0, double k2_=1.0)
            Xapian::LatLongDistancePostingSource::LatLongDistancePostingSource

            Parameters:
            -----------

            slot_:  The value slot to read values from.

            centre_:  The centre point to use for distance calculations.

            max_range_:  The maximum distance for documents which are returned.

            k1_:  The k1 constant to use in the weighting function.

            k2_:  The k2 constant to use in the weighting function.

            Xapian::GreatCircleMetric is used as the metric.
            """
            _xapian.LatLongDistancePostingSource_swiginit(self, _xapian.new_LatLongDistancePostingSource(*args))
        __swig_destroy__ = _xapian.delete_LatLongDistancePostingSource

    # Register LatLongDistancePostingSource in _xapian:
    _xapian.LatLongDistancePostingSource_swigregister(LatLongDistancePostingSource)

    class LatLongDistanceKeyMaker(KeyMaker):
        r"""

        KeyMaker subclass which sorts by distance from a latitude/longitude.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features

        Results are ordered by the distance from a fixed point, or list of
        points, calculated according to the metric supplied. If multiple
        points are supplied (either in the constructor, or in the coordinates
        stored in a document), the closest pointwise distance is used.

        If a document contains no coordinate stored in the specified slot, a
        special value for the distance will be used. This defaults to a large
        number, so that such results get a low rank, but may be specified by a
        constructor parameter.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr

        def __init__(self, *args):
            r"""

            Construct a LatLongDistanceKeyMaker.

            Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker(Xapian::valueno
            slot_, const LatLongCoord &centre_)
            Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker

            Parameters:
            -----------

            slot_:  Value slot to use.

            centre_:   Point to calculate distance from.

            Xapian::GreatCircleMetric is used as the metric.

            Documents where no value is set are assumed to be a large distance
            away.
            """
            _xapian.LatLongDistanceKeyMaker_swiginit(self, _xapian.new_LatLongDistanceKeyMaker(*args))
        __swig_destroy__ = _xapian.delete_LatLongDistanceKeyMaker

    # Register LatLongDistanceKeyMaker in _xapian:
    _xapian.LatLongDistanceKeyMaker_swigregister(LatLongDistanceKeyMaker)

    class Database(object):
        r"""

        An indexed database of documents.

        A Database object contains zero or more shards, and operations are
        performed across these shards.

        To perform a search on a Database, you need to use an Enquire object.

        2.0.0 This class is a reference counted handle like many other Xapian
        API classes. In earlier versions, it worked like a typedef to
        std::vector<database_shard>. The key difference is that previously
        copying or assigning a Xapian::Database made a deep copy, whereas now
        it makes a shallow copy.  Most methods can throw:

        Parameters:
        -----------

        Xapian::DatabaseCorruptError:  if database corruption is detected

        Xapian::DatabaseError:  in various situation (for example, if there's
        an I/O error).

        Xapian::DatabaseModifiedError:  if the revision being read has been
        discarded

        Xapian::DatabaseClosedError:  may be thrown by some methods after
        after  close() has been called

        Xapian::NetworkError:  when remote databases are in use
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        add_database = _swig_new_instance_method(_xapian.Database_add_database)
        size = _swig_new_instance_method(_xapian.Database_size)

        def __init__(self, *args):
            r"""

            Move constructor.

            Xapian::Database::Database(Database &&o) Xapian::Database::Database
            """
            _xapian.Database_swiginit(self, _xapian.new_Database(*args))
        __swig_destroy__ = _xapian.delete_Database
        reopen = _swig_new_instance_method(_xapian.Database_reopen)
        close = _swig_new_instance_method(_xapian.Database_close)
        __str__ = _swig_new_instance_method(_xapian.Database___str__)
        _postlist_begin = _swig_new_instance_method(_xapian.Database__postlist_begin)
        _postlist_end = _swig_new_instance_method(_xapian.Database__postlist_end)
        _termlist_begin = _swig_new_instance_method(_xapian.Database__termlist_begin)
        _termlist_end = _swig_new_instance_method(_xapian.Database__termlist_end)
        has_positions = _swig_new_instance_method(_xapian.Database_has_positions)
        _positionlist_begin = _swig_new_instance_method(_xapian.Database__positionlist_begin)
        _positionlist_end = _swig_new_instance_method(_xapian.Database__positionlist_end)
        _allterms_begin = _swig_new_instance_method(_xapian.Database__allterms_begin)
        _allterms_end = _swig_new_instance_method(_xapian.Database__allterms_end)
        get_doccount = _swig_new_instance_method(_xapian.Database_get_doccount)
        get_lastdocid = _swig_new_instance_method(_xapian.Database_get_lastdocid)
        get_average_length = _swig_new_instance_method(_xapian.Database_get_average_length)
        get_avlength = _swig_new_instance_method(_xapian.Database_get_avlength)
        get_total_length = _swig_new_instance_method(_xapian.Database_get_total_length)
        get_termfreq = _swig_new_instance_method(_xapian.Database_get_termfreq)
        term_exists = _swig_new_instance_method(_xapian.Database_term_exists)
        get_collection_freq = _swig_new_instance_method(_xapian.Database_get_collection_freq)
        get_value_freq = _swig_new_instance_method(_xapian.Database_get_value_freq)
        get_value_lower_bound = _swig_new_instance_method(_xapian.Database_get_value_lower_bound)
        get_value_upper_bound = _swig_new_instance_method(_xapian.Database_get_value_upper_bound)
        get_doclength_lower_bound = _swig_new_instance_method(_xapian.Database_get_doclength_lower_bound)
        get_doclength_upper_bound = _swig_new_instance_method(_xapian.Database_get_doclength_upper_bound)
        get_wdf_upper_bound = _swig_new_instance_method(_xapian.Database_get_wdf_upper_bound)
        get_unique_terms_lower_bound = _swig_new_instance_method(_xapian.Database_get_unique_terms_lower_bound)
        get_unique_terms_upper_bound = _swig_new_instance_method(_xapian.Database_get_unique_terms_upper_bound)
        valuestream_begin = _swig_new_instance_method(_xapian.Database_valuestream_begin)
        valuestream_end = _swig_new_instance_method(_xapian.Database_valuestream_end)
        get_doclength = _swig_new_instance_method(_xapian.Database_get_doclength)
        get_unique_terms = _swig_new_instance_method(_xapian.Database_get_unique_terms)
        get_wdfdocmax = _swig_new_instance_method(_xapian.Database_get_wdfdocmax)
        keep_alive = _swig_new_instance_method(_xapian.Database_keep_alive)
        get_document = _swig_new_instance_method(_xapian.Database_get_document)
        get_spelling_suggestion = _swig_new_instance_method(_xapian.Database_get_spelling_suggestion)
        _spellings_begin = _swig_new_instance_method(_xapian.Database__spellings_begin)
        _spellings_end = _swig_new_instance_method(_xapian.Database__spellings_end)
        _synonyms_begin = _swig_new_instance_method(_xapian.Database__synonyms_begin)
        _synonyms_end = _swig_new_instance_method(_xapian.Database__synonyms_end)
        _synonym_keys_begin = _swig_new_instance_method(_xapian.Database__synonym_keys_begin)
        _synonym_keys_end = _swig_new_instance_method(_xapian.Database__synonym_keys_end)
        get_metadata = _swig_new_instance_method(_xapian.Database_get_metadata)
        _metadata_keys_begin = _swig_new_instance_method(_xapian.Database__metadata_keys_begin)
        _metadata_keys_end = _swig_new_instance_method(_xapian.Database__metadata_keys_end)
        get_uuid = _swig_new_instance_method(_xapian.Database_get_uuid)
        locked = _swig_new_instance_method(_xapian.Database_locked)
        lock = _swig_new_instance_method(_xapian.Database_lock)
        unlock = _swig_new_instance_method(_xapian.Database_unlock)
        get_revision = _swig_new_instance_method(_xapian.Database_get_revision)
        check = _swig_new_static_method(_xapian.Database_check)
        compact = _swig_new_instance_method(_xapian.Database_compact)
        reconstruct_text = _swig_new_instance_method(_xapian.Database_reconstruct_text)

    # Register Database in _xapian:
    _xapian.Database_swigregister(Database)

    class WritableDatabase(Database):
        r"""

        This class provides read/write access to a database.

        A WritableDatabase object contains zero or more shards, and operations
        are performed across these shards. Documents added by add_document()
        are stored to the shards in a round-robin fashion.

        2.0.0 This class is a reference counted handle like many other Xapian
        API classes. In earlier versions, it worked like a typedef to
        std::vector<database_shard>. The key difference is that previously
        copying or assigning a Xapian::Database made a deep copy, whereas now
        it makes a shallow copy.  Most methods can throw:

        Parameters:
        -----------

        Xapian::DatabaseCorruptError:  if database corruption is detected

        Xapian::DatabaseError:  in various situation (for example, calling
        methods after  close() has been called)

        Xapian::NetworkError:  when remote databases are in use
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc="The membership flag")
        __repr__ = _swig_repr
        add_database = _swig_new_instance_method(_xapian.WritableDatabase_add_database)

        def __init__(self, *args):
            r"""

            Move constructor.

            Xapian::WritableDatabase::WritableDatabase(WritableDatabase &&o)
            Xapian::WritableDatabase::WritableDatabase
            """
            _xapian.WritableDatabase_swiginit(self, _xapian.new_WritableDatabase(*args))
        commit = _swig_new_instance_method(_xapian.WritableDatabase_commit)
        begin_transaction = _swig_new_instance_method(_xapian.WritableDatabase_begin_transaction)
        commit_transaction = _swig_new_instance_method(_xapian.WritableDatabase_commit_transaction)
        cancel_transaction = _swig_new_instance_method(_xapian.WritableDatabase_cancel_transaction)
        add_document = _swig_new_instance_method(_xapian.WritableDatabase_add_document)
        delete_document = _swig_new_instance_method(_xapian.WritableDatabase_delete_document)
        replace_document = _swig_new_instance_method(_xapian.WritableDatabase_replace_document)
        add_spelling = _swig_new_instance_method(_xapian.WritableDatabase_add_spelling)
        remove_spelling = _swig_new_instance_method(_xapian.WritableDatabase_remove_spelling)
        add_synonym = _swig_new_instance_method(_xapian.WritableDatabase_add_synonym)
        remove_synonym = _swig_new_instance_method(_xapian.WritableDatabase_remove_synonym)
        clear_synonyms = _swig_new_instance_method(_xapian.WritableDatabase_clear_synonyms)
        set_metadata = _swig_new_instance_method(_xapian.WritableDatabase_set_metadata)
        __swig_destroy__ = _xapian.delete_WritableDatabase

    # Register WritableDatabase in _xapian:
    _xapian.WritableDatabase_swigregister(WritableDatabase)
    remote_open = _xapian.remote_open
    remote_open_writable = _xapian.remote_open_writable

    # Set the documentation format - this is used by tools like "epydoc" to decide
    # how to format the documentation strings.
    __docformat__ = "restructuredtext en"

    ##################################
    # Support for iteration of MSets #
    ##################################

    class MSetItem(object):
        """An item returned from iteration of the MSet.

        The item supports access to the following attributes and properties:

         - `docid`: The Xapian document ID corresponding to this MSet item.
         - `weight`: The weight corresponding to this MSet item.
         - `rank`: The rank of this MSet item.  The rank is the position in the
           total set of matching documents of this item.  The highest document is
           given a rank of 0.  If the MSet did not start at the highest matching
           document, because a non-zero 'start' parameter was supplied to
           get_mset(), the first document in the MSet will have a rank greater than
           0 (in fact, it will be equal to the value of 'start' supplied to
           get_mset()).
         - `percent`: The percentage score assigned to this MSet item.
         - `document`: The document for this MSet item.  This can be used to access
           the document data, or any other information stored in the document (such
           as term lists).  It is lazily evaluated.
         - `collapse_key`: The value of the key which was used for collapsing.
         - `collapse_count`: An estimate of the number of documents that have been
           collapsed into this one.

        The collapse count estimate will always be less than or equal to the actual
        number of other documents satisfying the match criteria with the same
        collapse key as this document.  If may be 0 even though there are other
        documents with the same collapse key which satisfying the match criteria.
        However if this method returns non-zero, there definitely are other such
        documents.  So this method may be used to inform the user that there are
        "at least N other matches in this group", or to control whether to offer a
        "show other documents in this group" feature (but note that it may not
        offer it in every case where it would show other documents).

        """

        __slots__ = ('_mset', '_firstitem', 'docid', 'weight', 'rank',
                     'percent', 'collapse_key', 'collapse_count', '_document', )

        def __init__(self, iter, mset):
            self._mset = mset
            self._firstitem = self._mset.get_firstitem()
            self.docid = iter.get_docid()
            self.weight = iter.get_weight()
            self.rank = iter.get_rank()
            self.percent = iter.get_percent()
            self.collapse_key = iter.get_collapse_key()
            self.collapse_count = iter.get_collapse_count()
            self._document = None

        def _get_document(self):
            if self._document is None:
                self._document = self._mset._get_hit_internal(self.rank - self._firstitem).get_document()
            return self._document

        document = property(_get_document, doc="The document object corresponding to this MSet item.")

    class MSetIter(object):
        """An iterator over the items in an MSet.

        The iterator will return MSetItem objects, which will be evaluated lazily
        where appropriate.

        """
        __slots__ = ('_iter', '_end', '_mset')
        def __init__(self, mset):
            self._iter = mset._begin()
            self._end = mset._end()
            self._mset = mset

        def __iter__(self):
            return self

        def __next__(self):
            if self._iter == self._end:
                raise StopIteration
            else:
                r = MSetItem(self._iter, self._mset)
                next(self._iter)
                return r

    # Modify the MSet to allow access to the python iterators, and have other
    # convenience methods.

    def _mset_gen_iter(self):
        """Return an iterator over the MSet.

        The iterator will return MSetItem objects, which will be evaluated lazily
        where appropriate.

        """
        return MSetIter(self)
    MSet.__iter__ = _mset_gen_iter

    MSet.__len__ = lambda self: MSet.size(self)

    def _mset_getitem(self, index):
        """Get an item from the MSet.

        The supplied index is relative to the start of the MSet, not the absolute
        rank of the item.

        Returns an MSetItem.

        """
        if index < 0:
            index += len(self)
        if index < 0 or index >= len(self):
            raise IndexError("Mset index out of range")
        return MSetItem(self._get_hit_internal(index), self)
    MSet.__getitem__ = _mset_getitem
    MSet.get_hit = _mset_getitem

    ##################################
    # Support for iteration of ESets #
    ##################################

    class ESetItem(object):
        """An item returned from iteration of the ESet.

        The item supports access to the following attributes:

         - `term`: The term corresponding to this ESet item.
         - `weight`: The weight corresponding to this ESet item.

        """
        __slots__ = ('term', 'weight')

        def __init__(self, iter):
            self.term = iter.get_term()
            self.weight = iter.get_weight()

    class ESetIter(object):
        """An iterator over the items in an ESet.

        The iterator will return ESetItem objects.

        """
        __slots__ = ('_iter', '_end')
        def __init__(self, eset):
            self._iter = eset._begin()
            self._end = eset._end()

        def __iter__(self):
            return self

        def __next__(self):
            if self._iter == self._end:
                raise StopIteration
            else:
                r = ESetItem(self._iter)
                next(self._iter)
                return r

    # Modify the ESet to allow access to the python iterators, and have other
    # convenience methods.

    def _eset_gen_iter(self):
        """Return an iterator over the ESet.

        The iterator will return ESetItem objects.

        """
        return ESetIter(self)
    ESet.__iter__ = _eset_gen_iter

    ESet.__len__ = lambda self: ESet.size(self)

    #######################################
    # Support for iteration of term lists #
    #######################################

    class TermListItem(object):
        """An item returned from iteration of a term list.

        The item supports access to the following attributes and properties:

         - `term`: The term corresponding to this TermListItem.
         - `wdf`: The within document frequency of this term.
         - `termfreq`: The number of documents in the collection which are indexed
           by the term
         - `positer`: An iterator over the positions which the term appears at in
           the document.  This is only available until the iterator which returned
           this item next moves.

        """
        __slots__ = ('_iter', 'term', '_wdf', '_termfreq')

        def __init__(self, iter, term):
            self._iter = iter
            self.term = term
            self._wdf = None
            self._termfreq = None

            if iter._has_wdf == TermIter.EAGER:
                self._wdf = iter._iter.get_wdf()
            if iter._has_termfreq == TermIter.EAGER:
                self._termfreq = iter._iter.get_termfreq()

    # Support for sequence API
            sequence = ['term', 'wdf', 'termfreq', 'positer']
            if iter._has_wdf == TermIter.INVALID:
                sequence[1] = 0
            if iter._has_termfreq == TermIter.INVALID:
                sequence[2] = 0
            if iter._has_positions == TermIter.INVALID:
                sequence[3] = PositionIter()

        def _get_wdf(self):
            """Get the within-document-frequency of the current term.

            This will raise a InvalidOperationError exception if the iterator this
            item came from doesn't support within-document-frequencies.

            """
            if self._wdf is None:
                if self._iter._has_wdf == TermIter.INVALID:
                    raise InvalidOperationError("Iterator does not support wdfs")
                if self.term is not self._iter._lastterm:
                    raise InvalidOperationError("Iterator has moved, and does not support random access")
                self._wdf = self._iter._iter.get_wdf()
            return self._wdf
        wdf = property(_get_wdf, doc=
        """The within-document-frequency of the current term (if meaningful).

        This will raise a InvalidOperationError exception if the iterator
        this item came from doesn't support within-document-frequencies.

        """)

        def _get_termfreq(self):
            """Get the term frequency.

            This is the number of documents in the collection which are indexed by
            the term.

            This will raise a InvalidOperationError exception if the iterator this
            item came from doesn't support term frequencies.

            """
            if self._termfreq is None:
                if self._iter._has_termfreq == TermIter.INVALID:
                    raise InvalidOperationError("Iterator does not support term frequencies")
                if self.term is not self._iter._lastterm:
                    raise InvalidOperationError("Iterator has moved, and does not support random access")
                self._termfreq = self._iter._iter.get_termfreq()
            return self._termfreq
        termfreq = property(_get_termfreq, doc=
        """The term frequency of the current term (if meaningful).

        This is the number of documents in the collection which are indexed by the
        term.

        This will raise a InvalidOperationError exception if the iterator
        this item came from doesn't support term frequencies.

        """)

        def _get_positer(self):
            """Get a position list iterator.

            The iterator will return integers representing the positions that the
            term occurs at.

            This will raise a InvalidOperationError exception if the iterator this
            item came from doesn't support position lists, or if the iterator has
            moved on since the item was returned from it.

            """
            if self._iter._has_positions == TermIter.INVALID:
                raise InvalidOperationError("Iterator does not support position lists")
    # Access to position lists is always lazy, so we don't need to check
    # _has_positions.
            if self.term is not self._iter._lastterm:
                raise InvalidOperationError("Iterator has moved, and does not support random access")
            return PositionIter(self._iter._iter._positionlist_begin(),
                                self._iter._iter._positionlist_end())
        positer = property(_get_positer, doc=
        """A position iterator for the current term (if meaningful).

        The iterator will return integers representing the positions that the term
        occurs at.

        This will raise a InvalidOperationError exception if the iterator this item
        came from doesn't support position lists, or if the iterator has moved on
        since the item was returned from it.

        """)

    class TermIter(object):
        """An iterator over a term list.

        The iterator will return TermListItem objects, which will be evaluated
        lazily where appropriate.

        """
        __slots__ = ('_iter', '_end', '_has_termfreq', '_has_wdf',
                     '_has_positions', '_return_strings', '_lastterm', '_moved')

        INVALID = 0
        LAZY = 1
        EAGER = 2

        def __init__(self, start, end, has_termfreq=INVALID,
                     has_wdf=INVALID, has_positions=INVALID,
                     return_strings=False):
            self._iter = start
            self._end = end
            self._has_termfreq = has_termfreq
            self._has_wdf = has_wdf
            self._has_positions = has_positions
            assert(has_positions != TermIter.EAGER) # Can't do eager access to position lists
            self._return_strings = return_strings
            self._lastterm = None # Used to test if the iterator has moved

    # _moved is True if we've moved onto the next item.  This is needed so
    # that the iterator doesn't have to move on until just before next() is
    # called: since the iterator starts by pointing at a valid item, we
    # can't just call next(self._iter) unconditionally at the start of our
    # __next__() method.
            self._moved = True

        def __iter__(self):
            return self

        def __next__(self):
            if not self._moved:
                next(self._iter)
                self._moved = True

            if self._iter == self._end:
                self._lastterm = None
                raise StopIteration
            else:
                self._lastterm = self._iter.get_term()
                self._moved = False
                if self._return_strings:
                    return self._lastterm
                return TermListItem(self, self._lastterm)

        def skip_to(self, term):
            """Skip the iterator forward.

            The iterator is advanced to the first term at or after the current
            position which is greater than or equal to the supplied term.

            If there are no such items, this will raise StopIteration.

            This returns the item which the iterator is moved to.  The subsequent
            item will be returned the next time that next() is called (unless
            skip_to() is called again first).

            """
            if self._iter != self._end:
                self._iter.skip_to(term)

            if self._iter == self._end:
                self._lastterm = None
                self._moved = True
                raise StopIteration

    # Update self._lastterm if the iterator has moved.
    # TermListItems compare a saved value of lastterm with self._lastterm
    # with the object identity comparator, so it is important to ensure
    # that it does not get modified if the new term compares equal.
            newterm = self._iter.get_term()
            if newterm != self._lastterm:
                self._lastterm = newterm

            self._moved = False
            if self._return_strings:
                return self._lastterm
            return TermListItem(self, self._lastterm)

    # Modify Enquire to add a "matching_terms()" method.
    def _enquire_gen_iter(self, which):
        """Get an iterator over the terms which match a given match set item.

        The match set item to consider is specified by the `which` parameter, which
        may be a document ID, or an MSetItem object.

        The iterator will return string objects.

        """
        if isinstance(which, MSetItem):
            which = which.docid
        return TermIter(self._get_matching_terms_begin(which),
                        self._get_matching_terms_end(which),
                        return_strings=True)
    Enquire.matching_terms = _enquire_gen_iter

    # Modify Query to add an "__iter__()" method.
    def _query_gen_iter(self):
        """Get an iterator over the terms in a query.

        The iterator will return string objects.

        """
        return TermIter(self._get_terms_begin(),
                        self._get_terms_end(),
                        return_strings=True)
    Query.__iter__ = _query_gen_iter

    # Modify Database to add an "__iter__()" method and an "allterms()" method.
    def _database_gen_allterms_iter(self, prefix=None):
        """Get an iterator over all the terms in the database.

        The iterator will return TermListItem objects, but these will not support
        access to wdf, or position information.

        Access to term frequency information is only available until the iterator
        has moved on.

        If prefix is supplied, only terms which start with that prefix will be
        returned.

        """
        if prefix is None:
            return TermIter(self._allterms_begin(), self._allterms_end(),
                            has_termfreq=TermIter.LAZY)
        else:
            return TermIter(self._allterms_begin(prefix), self._allterms_end(prefix),
                            has_termfreq=TermIter.LAZY)
    Database.__iter__ = _database_gen_allterms_iter
    Database.allterms = _database_gen_allterms_iter

    # Modify Database to add a "termlist()" method.
    def _database_gen_termlist_iter(self, docid):
        """Get an iterator over all the terms which index a given document ID.

        The iterator will return TermListItem objects.

        Access to term frequency and position information is only available until
        the iterator has moved on.

        """
    # Note: has_termfreq is set to LAZY because most databases don't store term
    # frequencies in the termlist (because this would require updating many termlist
    # entries for every document update), so access to the term frequency requires a
    # separate lookup.
        return TermIter(self._termlist_begin(docid), self._termlist_end(docid),
                        has_termfreq=TermIter.LAZY,
                        has_wdf=TermIter.EAGER,
                        has_positions=TermIter.LAZY)
    Database.termlist = _database_gen_termlist_iter

    # Modify Database to add a "spellings()" method.
    def _database_gen_spellings_iter(self):
        """Get an iterator which returns all the spelling correction targets

        The iterator will return TermListItem objects.  Only the term frequency is
        available; wdf and positions are not meaningful.

        """
        return TermIter(self._spellings_begin(), self._spellings_end(),
                        has_termfreq=TermIter.EAGER,
                        has_wdf=TermIter.INVALID,
                        has_positions=TermIter.INVALID)
    Database.spellings = _database_gen_spellings_iter

    # Modify Database to add a "synonyms()" method.
    def _database_gen_synonyms_iter(self, term):
        """Get an iterator which returns all the synonyms for a given term.

        The term to return synonyms for is specified by the `term` parameter.

        The iterator will return string objects.

        """
        return TermIter(self._synonyms_begin(term),
                        self._synonyms_end(term),
                        return_strings=True)
    Database.synonyms = _database_gen_synonyms_iter

    # Modify Database to add a "synonym_keys()" method.
    def _database_gen_synonym_keys_iter(self, prefix=""):
        """Get an iterator which returns all the terms which have synonyms.

        The iterator will return string objects.

        If `prefix` is non-empty, only terms with this prefix are returned.

        """
        return TermIter(self._synonym_keys_begin(prefix),
                        self._synonym_keys_end(prefix),
                        return_strings=True)
    Database.synonym_keys = _database_gen_synonym_keys_iter

    # Modify Database to add a "metadata_keys()" method, instead of direct access
    # to metadata_keys_begin and metadata_keys_end.
    def _database_gen_metadata_keys_iter(self, prefix=""):
        """Get an iterator which returns all the metadata keys.

        The iterator will return string objects.

        If `prefix` is non-empty, only metadata keys with this prefix are returned.

        """
        return TermIter(self._metadata_keys_begin(prefix),
                        self._metadata_keys_end(prefix),
                        return_strings=True)
    Database.metadata_keys = _database_gen_metadata_keys_iter

    # Modify Document to add an "__iter__()" method and a "termlist()" method.
    def _document_gen_termlist_iter(self):
        """Get an iterator over all the terms in a document.

        The iterator will return TermListItem objects.

        Access to term frequency and position information is only available until
        the iterator has moved on.

        Note that term frequency information is only meaningful for a document
        retrieved from a database.  If term frequency information is requested for
        a document which was freshly created, an InvalidOperationError will be
        raised.

        """
    # Note: document termlist iterators may be implemented entirely in-memory
    # (in which case access to all items could be allowed eagerly), but may
    # also be implemented by returning a database termlist (for documents which
    # are stored in a database, rather than freshly created).  We choose the
    # most conservative settings, to avoid doing eager access when lazy access
    # would be more appropriate.
        return TermIter(self._termlist_begin(), self._termlist_end(),
                        has_termfreq=TermIter.LAZY,
                        has_wdf=TermIter.EAGER,
                        has_positions=TermIter.LAZY)
    Document.__iter__ = _document_gen_termlist_iter
    Document.termlist = _document_gen_termlist_iter

    # Modify QueryParser to add a "stoplist()" method.
    def _queryparser_gen_stoplist_iter(self):
        """Get an iterator over all the stopped terms from the previous query.

        This returns an iterator over all the terms which were omitted from the
        previously parsed query due to being considered to be stopwords.  Each
        instance of a word omitted from the query is represented in the returned
        list, in the order in which the

        The iterator will return string objects.

        """
        return TermIter(self._stoplist_begin(), self._stoplist_end(),
                        return_strings=True)
    QueryParser.stoplist = _queryparser_gen_stoplist_iter

    # Modify QueryParser to add an "unstemlist()" method.
    def _queryparser_gen_unstemlist_iter(self, tname):
        """Get an iterator over all the unstemmed forms of a stemmed term.

        This returns an iterator which returns all the unstemmed words which were
        stemmed to the stemmed form specified by `tname` when parsing the previous
        query.  Each instance of a word which stems to `tname` is returned by the
        iterator in the order in which the words appeared in the query - an
        individual unstemmed word may thus occur multiple times.

        The iterator will return string objects.

        """
        return TermIter(self._unstem_begin(tname), self._unstem_end(tname),
                        return_strings=True)
    QueryParser.unstemlist = _queryparser_gen_unstemlist_iter

    # Modify ValueCountMatchSpy to add a "values()" method.
    def wrapper():
        begin = ValueCountMatchSpy.values_begin
        del ValueCountMatchSpy.values_begin
        end = ValueCountMatchSpy.values_end
        del ValueCountMatchSpy.values_end
        def values(self):
            """Get an iterator over all the values in the slot.

            Values will be returned in ascending alphabetical order.

            The iterator will return TermListItem objects: the value can be
            accessed as the `term` property, and the frequency can be accessed as
            the `termfreq` property.

            """
            return TermIter(begin(self), end(self), has_termfreq=TermIter.EAGER)
        return values
    ValueCountMatchSpy.values = wrapper()
    del wrapper

    # Modify ValueCountMatchSpy to add a "top_values()" method.
    def wrapper():
        begin = ValueCountMatchSpy.top_values_begin
        del ValueCountMatchSpy.top_values_begin
        end = ValueCountMatchSpy.top_values_end
        del ValueCountMatchSpy.top_values_end
        def top_values(self, maxvalues):
            """Get an iterator over the most frequent values for the slot.

            Values will be returned in descending order of frequency.  Values with
            the same frequency will be returned in ascending alphabetical order.

            The iterator will return TermListItem objects: the value can be
            accessed as the `term` property, and the frequency can be accessed as
            the `termfreq` property.

            """
            return TermIter(begin(self, maxvalues), end(self, maxvalues),
                            has_termfreq=TermIter.EAGER)
        return top_values
    ValueCountMatchSpy.top_values = wrapper()
    del wrapper

    # When we make a query, keep a note of postingsources involved, so they won't
    # be deleted. This hack can probably be removed once xapian bug #186 is fixed.
    __query_init_orig = Query.__init__
    def _query_init(self, *args):
        """Make a new query object.

        Many possible arguments are possible - see the documentation for details.

        """
        ps = []
        if len(args) == 1 and isinstance(args[0], PostingSource):
            ps.append(args[0])
        else:
            for arg in args:
                if isinstance(arg, Query):
                    ps.extend(getattr(arg, '_ps', []))
                elif hasattr(arg, '__iter__'):
                    for listarg in arg:
                        if isinstance(listarg, Query):
                            ps.extend(getattr(listarg, '_ps', []))
        __query_init_orig(self, *args)
        self._ps = ps
    Query.__init__ = _query_init
    del _query_init

    # When setting a query on enquire, keep a note of postingsources involved, so
    # they won't be deleted. This hack can probably be removed once xapian bug #186
    # is fixed.
    __enquire_set_query_orig = Enquire.set_query
    def _enquire_set_query(self, query, qlen=0):
        self._ps = getattr(query, '_ps', [])
        return __enquire_set_query_orig(self, query, qlen)
    _enquire_set_query.__doc__ = __enquire_set_query_orig.__doc__
    Enquire.set_query = _enquire_set_query
    del _enquire_set_query

    # When getting  a query from enquire, keep a note of postingsources involved,
    # so they won't be deleted. This hack can probably be removed once xapian bug
    # #186 is fixed.
    __enquire_get_query_orig = Enquire.get_query
    def _enquire_get_query(self):
        query = __enquire_get_query_orig(self)
        query._ps = getattr(self, '_ps', [])
        return query
    _enquire_get_query.__doc__ = __enquire_get_query_orig.__doc__
    Enquire.get_query = _enquire_get_query
    del _enquire_get_query

    # When we set a RangeProcessor into the QueryParser, keep a python
    # reference so it won't be deleted. This hack can probably be removed once
    # xapian bug #186 is fixed.
    __queryparser_add_rangeprocessor_orig = QueryParser.add_rangeprocessor
    def _queryparser_add_rangeprocessor(self, rproc):
        if not hasattr(self, '_rps'):
            self._rps = []
        self._rps.append(rproc)
        return __queryparser_add_rangeprocessor_orig(self, rproc)
    _queryparser_add_rangeprocessor.__doc__ = __queryparser_add_rangeprocessor_orig.__doc__
    QueryParser.add_rangeprocessor = _queryparser_add_rangeprocessor
    del _queryparser_add_rangeprocessor

    # When we set a FieldProcessor into the QueryParser, keep a python
    # reference so it won't be deleted. This hack can probably be removed once
    # xapian bug #186 is fixed.
    __queryparser_add_prefix_orig = QueryParser.add_prefix
    def _queryparser_add_prefix(self, s, proc):
        if not isinstance(proc, (str, bytes)):
            if not hasattr(self, '_fps'):
                self._fps = []
            self._fps.append(proc)
        return __queryparser_add_prefix_orig(self, s, proc)
    _queryparser_add_prefix.__doc__ = __queryparser_add_prefix_orig.__doc__
    QueryParser.add_prefix = _queryparser_add_prefix
    del _queryparser_add_prefix
    __queryparser_add_boolean_prefix_orig = QueryParser.add_boolean_prefix
    def _queryparser_add_boolean_prefix(self, s, proc, exclusive = True):
        if not isinstance(proc, (str, bytes)):
            if not hasattr(self, '_fps'):
                self._fps = []
            self._fps.append(proc)
        return __queryparser_add_boolean_prefix_orig(self, s, proc, exclusive)
    _queryparser_add_boolean_prefix.__doc__ = __queryparser_add_boolean_prefix_orig.__doc__
    QueryParser.add_boolean_prefix = _queryparser_add_boolean_prefix
    del _queryparser_add_boolean_prefix

    # When we set a Stopper into the QueryParser, keep a python reference so it
    # won't be deleted. This hack can probably be removed once xapian bug #186 is
    # fixed.
    __queryparser_set_stopper_orig = QueryParser.set_stopper
    def _queryparser_set_stopper(self, stopper):
        self._stopper = stopper
        return __queryparser_set_stopper_orig(self, stopper)
    _queryparser_set_stopper.__doc__ = __queryparser_set_stopper_orig.__doc__
    QueryParser.set_stopper = _queryparser_set_stopper
    del _queryparser_set_stopper

    # When we set a Stopper into the TermGenerator, keep a python reference so it
    # won't be deleted. This hack can probably be removed once xapian bug #186 is
    # fixed.
    __termgenerator_set_stopper_orig = TermGenerator.set_stopper
    def _termgenerator_set_stopper(self, stopper):
        self._stopper = stopper
        return __termgenerator_set_stopper_orig(self, stopper)
    _termgenerator_set_stopper.__doc__ = __termgenerator_set_stopper_orig.__doc__
    TermGenerator.set_stopper = _termgenerator_set_stopper
    del _termgenerator_set_stopper

    # When we set a Sorter on enquire, keep a python reference so it won't be
    # deleted.  This hack can probably be removed once xapian bug #186 is fixed.
    __enquire_set_sort_by_key_orig = Enquire.set_sort_by_key
    def _enquire_set_sort_by_key(self, sorter, reverse):
        self._sorter = sorter
        return __enquire_set_sort_by_key_orig(self, sorter, reverse)
    _enquire_set_sort_by_key.__doc__ = __enquire_set_sort_by_key_orig.__doc__
    Enquire.set_sort_by_key = _enquire_set_sort_by_key
    del _enquire_set_sort_by_key

    __enquire_set_sort_by_key_then_relevance_orig = Enquire.set_sort_by_key_then_relevance
    def _enquire_set_sort_by_key_then_relevance(self, sorter, reverse):
        self._sorter = sorter
        return __enquire_set_sort_by_key_then_relevance_orig(self, sorter, reverse)
    _enquire_set_sort_by_key_then_relevance.__doc__ = __enquire_set_sort_by_key_then_relevance_orig.__doc__
    Enquire.set_sort_by_key_then_relevance = _enquire_set_sort_by_key_then_relevance
    del _enquire_set_sort_by_key_then_relevance

    __enquire_set_sort_by_relevance_then_key_orig = Enquire.set_sort_by_relevance_then_key
    def _enquire_set_sort_by_relevance_then_key(self, sorter, reverse):
        self._sorter = sorter
        return __enquire_set_sort_by_relevance_then_key_orig(self, sorter, reverse)
    _enquire_set_sort_by_relevance_then_key.__doc__ = __enquire_set_sort_by_relevance_then_key_orig.__doc__
    Enquire.set_sort_by_relevance_then_key = _enquire_set_sort_by_relevance_then_key
    del _enquire_set_sort_by_relevance_then_key

    ##########################################
    # Support for iteration of posting lists #
    ##########################################

    class PostingItem(object):
        """An item returned from iteration of a posting list.

        The item supports access to the following attributes and properties:

         - `docid`: The document ID corresponding to this PostingItem.
         - `doclength`: The length of the document corresponding to this
           PostingItem.
         - `wdf`: The within document frequency of the term which the posting list
           is for in the document corresponding to this PostingItem.
         - `positer`: An iterator over the positions which the term corresponing to
           this posting list occurs at in the document corresponding to this
           PostingItem.  This is only available until the iterator which returned
           this item next moves.

        """
        __slots__ = ('_iter', 'docid', 'doclength', 'wdf',)

        def __init__(self, iter):
            self._iter = iter
            self.docid = iter._iter.get_docid()
            self.doclength = iter._iter.get_doclength()
            self.wdf = iter._iter.get_wdf()

    # Support for sequence API
            sequence = ['docid', 'doclength', 'wdf', 'positer']
            if not iter._has_positions:
                sequence[3] = PositionIter()

        def _get_positer(self):
            """Get a position list iterator.

            The iterator will return integers representing the positions that the
            term occurs at in the document corresponding to this PostingItem.

            This will raise a InvalidOperationError exception if the iterator this
            item came from doesn't support position lists, or if the iterator has
            moved on since the item was returned from it.

            """
            if not self._iter._has_positions:
                raise InvalidOperationError("Iterator does not support position lists")
            if self._iter._iter == self._iter._end or \
               self.docid != self._iter._iter.get_docid():
                raise InvalidOperationError("Iterator has moved, and does not support random access")
            return PositionIter(self._iter._iter._positionlist_begin(),
                                self._iter._iter._positionlist_end())
        positer = property(_get_positer, doc=
        """A position iterator for the current posting (if meaningful).

        The iterator will return integers representing the positions that the term
        occurs at.

        This will raise a InvalidOperationError exception if the iterator this item
        came from doesn't support position lists, or if the iterator has moved on
        since the item was returned from it.

        """)

    class PostingIter(object):
        """An iterator over a posting list.

        The iterator will return PostingItem objects, which will be evaluated
        lazily where appropriate.

        """
        __slots__ = ('_iter', '_end', '_has_positions', '_moved')

        def __init__(self, start, end, has_positions=False):
            self._iter = start
            self._end = end
            self._has_positions = has_positions

    # _moved is True if we've moved onto the next item.  This is needed so
    # that the iterator doesn't have to move on until just before next() is
    # called: since the iterator starts by pointing at a valid item, we
    # can't just call next(self._iter) unconditionally at the start of our
    # __next__() method.
            self._moved = True

        def __iter__(self):
            return self

        def __next__(self):
            if not self._moved:
                next(self._iter)
                self._moved = True

            if self._iter == self._end:
                raise StopIteration
            else:
                self._moved = False
                return PostingItem(self)

        def skip_to(self, docid):
            """Skip the iterator forward.

            The iterator is advanced to the first document with a document ID
            which is greater than or equal to the supplied document ID.

            If there are no such items, this will raise StopIteration.

            This returns the item which the iterator is moved to.  The subsequent
            item will be returned the next time that next() is called (unless
            skip_to() is called again first).

            """
            if self._iter != self._end:
                self._iter.skip_to(docid)
            if self._iter == self._end:
                self._moved = True
                raise StopIteration
            self._moved = False
            return PostingItem(self)

    def _database_gen_postlist_iter(self, tname):
        """Get an iterator over the postings which are indexed by a given term.

        If `tname` is empty, an iterator over all the documents will be returned
        (this will contain one entry for each document, will always return a wdf of
        1, and will not allow access to a position iterator).

        """
        if len(tname) != 0:
            return PostingIter(self._postlist_begin(tname), self._postlist_end(tname),
                               has_positions=True)
        else:
            return PostingIter(self._postlist_begin(tname), self._postlist_end(tname))
    Database.postlist = _database_gen_postlist_iter

    ###########################################
    # Support for iteration of position lists #
    ###########################################

    class PositionIter(object):
        """An iterator over a position list.

        The iterator will return integers, in ascending order.

        """
        def __init__(self, start = 0, end = 0):
            self.iter = start
            self.end = end

        def __iter__(self):
            return self

        def __next__(self):
            if self.iter==self.end:
                raise StopIteration
            else:
                r = self.iter.get_termpos()
                next(self.iter)
                return r

    # Modify Database to add a "positionlist()" method.
    def _database_gen_positionlist_iter(self, docid, tname):
        """Get an iterator over all the positions in a given document of a term.

        The iterator will return integers, in ascending order.

        """
        return PositionIter(self._positionlist_begin(docid, tname), self._positionlist_end(docid, tname))
    Database.positionlist = _database_gen_positionlist_iter

    ########################################
    # Support for iteration of value lists #
    ########################################

    class ValueItem(object):
        """An item returned from iteration of the values in a document.

        The item supports access to the following attributes:

         - `num`: The number of the value.
         - `value`: The contents of the value.

        """

        __slots__ = ('num', 'value', )

        def __init__(self, num, value):
            self.num = num
            self.value = value

    class ValueIter(object):
        """An iterator over all the values stored in a document.

        The iterator will return ValueItem objects, in ascending order of value number.

        """
        def __init__(self, start, end):
            self.iter = start
            self.end = end

        def __iter__(self):
            return self

        def __next__(self):
            if self.iter==self.end:
                raise StopIteration
            else:
                r = ValueItem(self.iter.get_valueno(), self.iter.get_value())
                next(self.iter)
                return r

    # Modify Document to add a "values()" method.
    def _document_gen_values_iter(self):
        """Get an iterator over all the values stored in a document.

        The iterator will return ValueItem objects, in ascending order of value number.

        """
        return ValueIter(self._values_begin(), self._values_end())
    Document.values = _document_gen_values_iter

    ##########################################
    # Support for iteration of value streams #
    ##########################################

    class ValueStreamItem(object):
        """An item returned from iteration of the values in a document.

        The item supports access to the following attributes:

         - `docid`: The docid for the item.
         - `value`: The contents of the value.

        """

        __slots__ = ('docid', 'value', )

        def __init__(self, docid, value):
            self.docid = docid
            self.value = value

    class ValueStreamIter(object):
        """An iterator over all the values stored in a document.

        The iterator will return ValueStreamItem objects, in ascending order of value number.

        """
        def __init__(self, start, end):
            self.iter = start
            self.end = end
            self.moved = True

        def __iter__(self):
            return self

        def __next__(self):
            if not self.moved:
                self.iter.__next__()
                self.moved = True

            if self.iter==self.end:
                raise StopIteration
            else:
                self.moved = False
                return ValueStreamItem(self.iter.get_docid(), self.iter.get_value())

        def skip_to(self, docid):
            """Skip the iterator forward.

            The iterator is advanced to the first document with a document ID
            which is greater than or equal to the supplied document ID.

            If there are no such items, this will raise StopIteration.

            This returns the item which the iterator is moved to.  The subsequent
            item will be returned the next time that next() is called (unless
            skip_to() is called again first).

            """
            if self.iter != self.end:
                self.iter.skip_to(docid)
            if self.iter == self.end:
                self.moved = True
                raise StopIteration
            self.moved = False
            return ValueStreamItem(self.iter.get_docid(), self.iter.get_value())

    # Modify Database to add a "valuestream()" method, and remove the
    # valuestream_begin() and valuestream_end() methods.
    def wrapper():
        vs_begin = Database.valuestream_begin
        del Database.valuestream_begin
        vs_end = Database.valuestream_end
        del Database.valuestream_end
        def valuestream(self, slot):
            """Get an iterator over all the values stored in a slot in the database.

            The iterator will return ValueStreamItem objects, in ascending order of
            document id.

            """
            return ValueStreamIter(vs_begin(self, slot), vs_end(self, slot))
        return valuestream
    Database.valuestream = wrapper()
    del wrapper

    ##########################################
    # Support for iteration of LatLongCoords #
    ##########################################

    class LatLongCoordsIter(object):
        """An iterator over all the coordinates in a LatLongCoords object.

        The iterator returns LatLongCoord objects.

        """
        def __init__(self, start, end):
            self.iter = start
            self.end = end

        def __iter__(self):
            return self

        def __eq__(self, other):
            return self.equals(other)

        def __ne__(self, other):
            return not self.equals(other)

        def __next__(self):
            if self.iter.equals(self.end):
                raise StopIteration
            else:
                r = self.iter.get_coord()
                self.iter.__next__()
                return r

    # Modify LatLongCoords to make it iterable.
    def _latlongcoords_iter(self):
        """Get an iterator over all the coordinates in a LatLongCoords.

        The iterator will return xapian.LatLongCoord objects.

        """
        return LatLongCoordsIter(self.begin(), self.end())
    LatLongCoords.__iter__ = _latlongcoords_iter
    del _latlongcoords_iter
    del LatLongCoordsIterator

    # Fix up Enquire so that it keeps a python reference to the deciders supplied
    # to it so that they won't be deleted before the Enquire object.  This hack can
    # probably be removed once xapian bug #186 is fixed.
    _enquire_add_matchspy_orig = Enquire.add_matchspy
    def _enquire_match_spy_add(self, decider):
        if not hasattr(self, '_deciders'):
            self._deciders = []
        self._deciders.append(decider)
        _enquire_add_matchspy_orig(self, decider)
    _enquire_match_spy_add.__doc__ = Enquire.add_matchspy.__doc__
    Enquire.add_matchspy = _enquire_match_spy_add

    _enquire_clear_matchspies_orig = Enquire.clear_matchspies
    def _enquire_match_spies_clear(self):
        _enquire_clear_matchspies_orig(self)
        if hasattr(self, '_deciders'):
            del self._deciders
    _enquire_match_spies_clear.__doc__ = Enquire.clear_matchspies.__doc__
    Enquire.clear_matchspies = _enquire_match_spies_clear

    # Fix up Stem.__init__() so that it calls __disown__() on the passed
    # StemImplementation object so that Python won't delete it from under us.
    _stem_init_orig = Stem.__init__
    def _stem_init(self, *args):
        _stem_init_orig(self, *args)
        if len(args) > 0 and isinstance(args[0], StemImplementation):
            args[0].__disown__()
    _stem_init.__doc__ = Stem.__init__.__doc__
    Stem.__init__ = _stem_init

    # Add wrappers for Query::MatchAll and Query::MatchNothing
    Query.MatchAll = Query("")
    Query.MatchNothing = Query()

    # Set the list of names which should be public.
    # Note that this needs to happen at the end of xapian.py.
    __all__ = []
    for item in dir():
        if item.startswith('_') or item.endswith('_swigregister') or item.endswith('Iterator'):
            continue
        __all__.append(item)
    __all__ = tuple(__all__)