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Classes, Packages and Page Styles
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<TABLE CELLPADDING=0 CELLSPACING=0 WIDTH="100%">
<TR><TD BGCOLOR="#2de52d"><DIV ALIGN=center><TABLE>
<TR><TD><FONT SIZE=5><B><A NAME="htoc63">B.5</A></B></FONT></TD>
<TD WIDTH="100%" ALIGN=center><FONT SIZE=5><B>Classes, Packages and Page Styles</B></FONT></TD>
</TR></TABLE></DIV></TD>
</TR></TABLE><UL>
<LI><A HREF="manual020.html#toc48">Document Class</A>
<LI><A HREF="manual020.html#toc49">Packages and Page Styles</A>
<LI><A HREF="manual020.html#toc50">The Title Page and Abstract</A>
</UL>
<BR>
<A NAME="toc48"></A><TABLE CELLPADDING=0 CELLSPACING=0 WIDTH="100%">
<TR><TD BGCOLOR="#66ff66"><DIV ALIGN=center><TABLE>
<TR><TD><FONT SIZE=4><B><A NAME="htoc64">B.5.1</A></B></FONT></TD>
<TD WIDTH="100%" ALIGN=center><FONT SIZE=4><B>Document Class</B></FONT></TD>
</TR></TABLE></DIV></TD>
</TR></TABLE>
Both L<sup>A</sup>T<sub>E</sub>X&nbsp;2<FONT FACE=symbol>e</FONT> <CODE>\documentclass</CODE> and old L<sup>A</sup>T<sub>E</sub>X
<CODE>\documentstyle</CODE> are accepted.
Their argument <EM>style</EM> is interpreted by attempting to load a
<EM>style</EM><TT>.hva</TT> file (see&nbsp;<A HREF="manual044.html#comline">C.1.1.1</A> to see where H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A
searches for files).
Presently, only the style files <TT>article.hva</TT>, <TT>seminar.hva</TT>,
<TT>book.hva</TT> and <TT>report.hva</TT> exist, the latter two
being equivalent.<BR>
<BR>
If one of the reckognized styles has already been loaded at the time when
<CODE>\documentclass</CODE> or
<CODE>\documentstyle</CODE> is executed, then no attempt to load a style
file is made. This allows to override the document style file by
giving one of the four recognized style files of H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A as command
line arguments (see section&nbsp;<A HREF="manual005.html#otherbase">2.2</A>).<BR>
<BR>
Conversely, if H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A attempt to load <EM>style</EM><TT>.hva</TT>
fails, then a fatal error is flagged, since it can be sure
that the document cannot be processed.<BR>
<BR>
<A NAME="toc49"></A><TABLE CELLPADDING=0 CELLSPACING=0 WIDTH="100%">
<TR><TD BGCOLOR="#66ff66"><DIV ALIGN=center><TABLE>
<TR><TD><FONT SIZE=4><B><A NAME="htoc65">B.5.2</A></B></FONT></TD>
<TD WIDTH="100%" ALIGN=center><FONT SIZE=4><B>Packages and Page Styles</B></FONT></TD>
</TR></TABLE></DIV></TD>
</TR></TABLE><A NAME="usepackage"></A><BR>
H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A reacts to
<CODE>\usepackage[</CODE><I>options</I><CODE>]{</CODE><I>pkg</I><CODE>}</CODE> in
the following way:
<OL type=1><LI>
The whole
<CODE>\usepackage</CODE> command with its arguments gets echoed to the
<EM>image</EM> file (see&nbsp;<A HREF="manual009.html#imagen">6</A>).
<LI>H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A attempt to load file <I>pkg</I><TT>.hva</TT>,
(see section&nbsp;<A HREF="manual044.html#search:path">C.1.1.1</A> on where H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A searches for files).
</OL>
Note that H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A will not fail if it cannot load
<I>pkg</I><TT>.hva</TT> and that no warning is issued in that case.<BR>
<BR>
The H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A distribution contains implementations of some packages,
such as <TT>verbatim</TT>, <TT>colors</TT>, <TT>graphics</TT>, etc.<BR>
<BR>
In some situations it may not hurt at all if H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A does not
implement a package, for instance H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A does not provide an
implementation for the packages <TT>isolatin1</TT> or
<TT>fullpage</TT>...<BR>
<BR>
Users needing an implementation of a package that is widely used and
available are encouraged to contact the
<A HREF="mailto:Luc.Maranget@inria.fr">author</A>.
Experienced users may find it fun to attempt to write package
implementations by themselves.<BR>
<BR>
<A NAME="toc50"></A><TABLE CELLPADDING=0 CELLSPACING=0 WIDTH="100%">
<TR><TD BGCOLOR="#66ff66"><DIV ALIGN=center><TABLE>
<TR><TD><FONT SIZE=4><B><A NAME="htoc66">B.5.3</A></B></FONT></TD>
<TD WIDTH="100%" ALIGN=center><FONT SIZE=4><B>The Title Page and Abstract</B></FONT></TD>
</TR></TABLE></DIV></TD>
</TR></TABLE>
<A NAME="@default103"></A>
All title related commands exist, with the following peculiarities:
<UL><LI>
 The <CODE>\title</CODE> command must appear in the preamble for the title
to appear in HTML document header.
 <LI>When not present the date is left empty. The <CODE>\today</CODE>
command generates will work properly only if <TT>hevea</TT> is invoked
with the <CODE>-exec xxdate.exe</CODE> option.
Otherwise <CODE>\today</CODE> generates nothing and a warning is issued.
</UL>
The <CODE>abstract</CODE> environment is present is all base styles,
including the <EM>book</EM> style.
The <CODE>titlepage</CODE> environment does nothing.<BR>
<BR>
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