Main Page | See live article | Alphabetical index Tree Regular Expressions for XML (TREX) is a simple schema language for XML. ; TREX's author, James Clark, says : A TREX pattern specifies a pattern for the structure and content of an XML document. A TREX pattern thus identifies a class of XML documents consisting of those documents that match the pattern. A TREX pattern is itself an XML document. TREX has been merged with RELAX to create RELAX NG. All future development of TREX will take place as part of the RELAX NG effort. External links http://thaiopensource.com/trex/ This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.