EXPath - Collaboratively Defining Open Standards for Portable XPath Extensions
ServletX ( www.expath.org ), a small web container for executing xslt, xproc, xquery, and such
he Saxon-EE product includes within a single package:
A schema-aware XSLT 2.0 processor
A schema-aware XQuery 1.0 processor
An XPath processor that can be called from Java applications
A free-standing XML Schema validator.
Saxon is written in 100% Java and therefore runs on any popular platform