RELAX NG
In 
computing, 
RELAX New Generation (
RELAX NG) is a simple schema language for 
XML, based on 
RELAX and 
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.
It is specified by the standard ISO/IEC 19757-2, the Document Schema Definition Languages (DSDL)
See also
External links
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