In computing, RELAX Next Generation (RELAX NG) is a simple yet elegant schema language for XML, based on Murata Makoto's RELAX and James Clark's TREX. A RELAX NG schema specifies a pattern for the structure and content of an XML document. A RELAX NG schema is itself an XML document; however, RELAX NG also offers a popular compact, non-XML syntax.

It is specified by a committee specification of the OASIS RELAX NG technical committee, and also as an international standard ISO/IEC 19757-2 the Document Schema Definition Languages (DSDL).

See also

• Schematron
• XML Schema

External links

• RELAX NG home page
• "The Design of RELAX NG" by James Clark
• RELAX NG tutorial for the XML syntax
• RELAX NG tutorial for the compact syntax
• Design patterns for structuring XML documents
• Relax NG XML - The Book