.
86 [<<#183#>option-list<#183#>>] {<<#184#>class-name<#184#>>}
[<<#185#>release-date<#185#>>]
This command replaces the
LaTeX~2.09 command 87.
There must be exactly one 88 command in a document; and
it must come after the 89 environments, if any, but before
any other commands.
The <<#187#>option-list<#187#>> is a list of options, each of which may modify the
formatting of elements which are defined in the <<#188#>class-name<#188#>> file,
as well as those in all following 90 commands (see
below).
The optional argument <<#189#>release-date<#189#>> can be used to specify the
earliest desired release date of the class file; it should contain a
date in the format <#190#>YYYY/MM/DD<#190#>. If a version of the class
older than this date is found, a warning is issued.
For example, to specify a two-column article, using a version of
91 released after June 1994, you specify:
verbatim10
92 [<<#192#>option-list<#192#>>] {<<#193#>class-name<#193#>>}
This command is still supported for compatibility with old files. It
is essentially the same as 93 except that it invokes
<#195#>LaTeX~2.09 compatibility mode<#195#>. It also causes any options in
the <<#196#>option-list<#196#>> that are not processed by the class file to be
loaded as packages after the class has been loaded. See
Section~#Sec209#197> for more details on LaTeX~2.09 compatibility
mode.
94 [<<#199#>option-list<#199#>>] {<<#200#>package-name<#200#>>} [<<#201#>release-date<#201#>>]
Any number of 95 commands is allowed. Each package file
(as denoted by <<#203#>package-name<#203#>>) defines new elements (or modifies
those defined in the class file loaded by the <<#204#>class-name<#204#>> argument
of the 96 command). A package file thus extends the
range of documents which can be processed.
The <<#205#>option-list<#205#>> argument can contain a list of options, each of
which can modify the formatting of elements which are defined in this
<<#206#>package-name<#206#>> file.
As above, <<#207#>release-date<#207#>> can contain the earliest desired release
date of the package file in the format <#208#>YYYY/MM/DD<#208#>; if an
older version of the package is found, a warning is issued.
For example, to load the 97 package for the 98 driver,
using a version of 99 released after June 1994, you write:
verbatim11
Each package is loaded only once. If the same package is requested
more than once, nothing happens in the second or following attempt
unless the package has been requested with options that were not given
in the original 100. If such extra options are specified
then an error message is produced. See Section~#Secproblems#209> how
to resolve this problem.
As well as processing the options given in the <<#210#>option-list<#210#>> of the
101 command, each package processes the
<<#211#>option-list<#211#>> of the 102 command as well. This
means that any option which should be processed by every package (to
be precise, by every package that specifies an action for it) can be
specified just once, in the 103 command, rather than
being repeated for each package that needs it.
104
If this command is placed in the preamble then a list of the files
read in (as a result of processing the document) will be displayed
on the terminal (and in the log file) at the end of the run. Where
possible, a short description will also be produced.
<#215#>Warning<#215#>: this command will list only files which were read
using LaTeX<#216#><#216#> commands such as 105{<<#217#>file<#217#>>} or
106{<<#218#>file<#218#>>}. If the file was read using the primitive TeX<#219#><#219#>
syntax 107<#220#>file<#220#> (without 108 braces around the file name)
then it will not be listed; failure to use the LaTeX<#221#><#221#> form with the
braces can cause more severe problems, possibly leading to overwriting
important files, so <#222#>always put in the braces<#222#>.
109 {<<#224#>num<#224#>>}
TeX~3 introduced a new primitive 110 which controls
the format of error messages. LaTeX2e\ provides an interface to this
through the standard 111 command. As most LaTeX\ users do
not want to see the internal definitions of LaTeX\ commands each time
they make an error, LaTeX2e<#226#><#226#> sets this to -1 by default.