Try RELAX NG without installing any software

RELAX NG has just become a Draft International Standard of ISO/IEC.  
You can try several example schemas and instances from the following 
WWW page.

http://www.asahi-net.or.jp/~eb2m-mrt/onLineValidation.html

These examples are quoted from the official tutorial at:

http://www.oasis-open.org/committees/relax-ng/tutorial-20011203.html

Cheers,

-- 
MURATA Makoto <>