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.

Scheme	Download
Bigloo	ssax-sxml library maintained by D. Lizorkin
Chicken	ssax.egg by Felix Winkelmann
Gambit	ssax-gambit-49.tgz
Gauche
Guile	ssax-guile-49.tgz
Vanilla R5RS	ssax-sr5rs-plt200-4.9.tar.gz by Michael Sperber. Supports Scheme48/SCSH and PLT 2xx.
PLT version 103 (Obsolete)	ssax-plt-49.tgz
PLT version 2xx	ssax20031007.plt (based on SSAX 4.9) ssax20040221.plt (latest - based on SSAX RELEASE_4A_PT)
SISC	SSAX port by Noel Walsh

More information (including myenv-*.scm files for SCM and MIT Scheme) may be found at http://ssax.sourceforge.net site.