SSAX is Oleg Kiselyov's XML parsing
framework available for a number of different Scheme implementations.
It provides a set of "lego blocks" for functional XML parsing,
which may be used for construction of customized XML (or even HTML) parsers,
and a high level XML->SXML parser which is very easy to use.
More information (including
myenv-*.scm files for SCM and MIT Scheme) may be found
at http://ssax.sourceforge.net site.