RELAX NG Specification (errata), OASIS Committee Specification, 3 December 2001. Can be used as a library for validation and for accessing the schema.
Definitive specification for RELAX NG using the XML syntax.
ISO/IEC 19757-03 Document Schema Definition Language (DSDL) -- Part 2: Regular-grammar-based validation -- RELAX NG.
ISO version of RELAX NG Specification; the technical content of this is identical to the OASIS Committee Specification, but there are editorial changes to satisfy ISO rules. RNV Relax NG Compact Syntax validator in ANSI C (under BSD license) Libxml2, the XML C library for Gnome.
project for extending RELAX NG has started in ISO/IEC JTC1/SC34/WG1.
RELAX NG is also an International Standard (ISO/IEC 19757-2).
RELAX NG Tutorial (errata), OASIS Committee Specification, 3 December 2001. More recent, but not officially approved Working Draft, 26 March 2003 also available RELAX NG Compact Syntax Tutorial, OASIS Working Draft, 26 March 2003.
Tutorial for RELAX NG using the compact syntax, not assuming prior knowledge of XML syntax. Also supports other schema languages including W3C XML Schema.
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.
ISO/IEC 19757-2: Amd1 Document Schema Definition Language (DSDL) -- Part 2: Regular-grammar-based validation -- RELAX NG -- Amendment 1: Compact Syntax.