RELAX NG: XML Schema Language Documentation and Technical Reference

RELAX NG is a schema language for XML developed as an international standard (ISO/IEC 19757-2) by OASIS and ISO/IEC. The article provides comprehensive documentation about RELAX NG, including its key features, specifications, development history, and technical details. It explains that RELAX NG was based on TREX by James Clark and RELAX Core by MURATA Makoto, and covers its syntax, validation capabilities, and integration with other XML technologies. The content serves as official documentation and reference material for this XML schema language standard.