RELAX NG is a schema language for XML. The key features of RELAX NG are that it:
The RELAX NG specifications have been developed within OASIS by the RELAX NG Technical Committeee . RELAX NG is also an International Standard (ISO/IEC 19757-2). It is Part 2 of ISO/IEC 19757 DSDL (Document Schema Definition Languages), which is maintained by ISO/IEC JTC1/SC34/WG1 . RELAX NG was based on TREX designed by James Clark and RELAX Core designed by MURATA Makoto.