# links /usr/local/share/doc/apache/howto/ssi.html.html
...
  Including the results of a CGI program

   This is one of the more common uses of SSI - to output the results of a
   CGI program, such as everybody's favorite, a ``hit counter.''

         <!--#include virtual="/cgi-bin/counter.pl" -->
...
# man xsltproc
...
INTRODUCTION
       xsltproc is a command line tool for applying XSLT stylesheets  to  XML
       documents.  It  is part of libxslt, the XSLT C library for GNOME. While
       it was developed as part of the GNOME project, it can operate  indepen-
       dently of the GNOME desktop.
...             
MORE INFORMATION
       libxml web page:http://www.xmlsoft.org/: http://www.xmlsoft.org/