How to add your own modules?

[Matt Gushee <mgushee@havenrock.com>]

Hi, Folks--

I'm new to this list--and to ConTeXt. Just a bit of background for those
who care about such things: I have been working intensively with XML and
SGML for several years, and lately I have been looking for a good way to
produce printed documents from XML. I find FOP very disappointing, but
I'm not very concerned about buzzword-compliance; I insist on quality
output. ConTeXt looks very promising for XML as well as other
inputs--and having some previous TeX experience, I find it easy to use.

Anyway, I'm puzzled about how to add my own customized modules to the
system. Last month I used ConTeXt to create a PDF slideshow for a
presentation, but I wanted to use a modified version of one of the
Pragma presentation styles. I tried putting my customized module, oh, I
think in a directory under /usr/local/share/texmf, where my teTeX
installation is supposed to be able to find files, but I was unable to
make this work. I eventually gave up and just modified the original file
in /usr/share/texmf/tex/context/base (by the way, according to my
reading of the license it is okay to do that for personal use, but if
that's not the case, please tell me and I won't do it again).

I have browsed through several manuals trying to find out how to do
this, but haven't found any answers. Is there some documentation that
explains how to customize the system?

-- 
Matt Gushee                 When a nation follows the Way,
Englewood, Colorado, USA    Horses bear manure through
mgushee@havenrock.com           its fields;
http://www.havenrock.com/   When a nation ignores the Way,
                            Horses bear soldiers through
                                its streets.
                                
                            --Lao Tzu (Peter Merel, trans.)