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The macro files for all converters are (by default) installed to a directory 
<code>/usr/local/lib/yodl</code>. This is a good place to look if you want to 
see how a converter works, or if you want to write a new converter. 

The place to start looking is the file <code>shared.yo</code>, which is used by all 
converters. This file defines most commands that are `global' in the sense 
that all converters implement them: e.g., <code>bf</code>, <code>em</code> and so on. The 
implementation is per macro as follows, illustrated for e.g., <code>bf</code> (the 
actual implementation may be slightly different):

<pre>
DEFINEMACRO(bf)(1)(\ 
        whenlatex(latexcommand({\bf )ARG1+latexcommand(}))\ 
        whenhtml(htmlcommand(&lt;strong&gt;)ARG1+htmlcommand(&lt;/strong&gt;))\ 
        whenman(mancommand(\fB)ARG1+mancommand(\fP))\ 
        whensgml(sgmlcommand(&lt;bf&gt;)ARG1+sgmlcommand(&lt;/bf&gt;))\ 
        whentxt(ARG1))
</pre>

<p>The macro expands to a set of commands that are active per output format, 
using <code>latexcommand</code>, <code>htmlcommand</code> etc..
<p>The file <code>shared.yo</code> is included in its turn by <code>tex.yo</code>, <code>html.yo</code> and 
so on. These separate files are very short; their function is to:
<p><dl>
<p><li > define the conversion type with an appropriate symbol (<code>latex</code> for
    latex conversions, <code>html</code> for HTML, and so on),
<p><li > activate character tables (when necessary),
<p><li > include <code>shared.dm</code>,
<p><li > define special macros for the particular conversion (when necessary).
<p></dl>
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<p>
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Copyright (c) 1997, 1998, 1999 Karel Kubat and Jan Nieuwenhuizen.

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