James Clark has released a new version of his Jing
validator for Relax NG, adding support for validating document
instances against Schematron and W3C XML schemas, and also implementing support for
the Namespace Routing Language (NRL).
This release of Jing makes it useable for validating documents
composed of elements and attributes from multiple independent
namespaces, with each of these namespaces having its own Relax NG,
Schematron, or W3C XML schema.