What is Relaxed (http://relaxed.vse.cz/nextgeneration/)
Web-based GUI around JNVDL
Namespace restaurant
Custom NVDL scripts
A library of advanced schemas for variety of XML languages (including compound languages)
Using advanced XML validation techniques
Schematron embedded in RELAX NG
NVDL
XSLT-based validation
More constraints captured automatically
Better diagnostic messages for the users