RELAX NG is a schema language for XML. The key features of RELAX NG are that it:
is simpleis easy to learnhas both an XML syntax and a compact non-XML syntaxdoes not change the information set of an XML documentsupports XML namespacestreats attributes uniformly with elements so far as possiblehas unrestricted support for unordered contenthas unrestricted support for mixed contenthas a solid theoretical basiscan partner with a separate datatyping language (such W3C XML Schema Datatypes)The RELAX NG specifications have been developed within OASIS by the RELAX NG Technical Committeee. RELAX NG is being developed into an International Standard (ISO/IEC 19757-2) by ISO/IEC JTC1/SC34/WG1; it is currently at the final stage of standardization. RELAX NG was based on TREX designed by James Clark and RELAX designed by MURATA Makoto.
