▽The Design of RELAX NG ●03/23 00:14 A property related to composability is closure. RELAX NG is closed under union: for any two RELAX NG schemas, there is a RELAX NG schema for its union. RELAX NG’s composability makes the construction of the union trivial: just wrap the two schemas in a choice element. Closure under union implies that the content model of an element can be context dependent. This is a major difference from XML DTDs
▽RELAX NG Specification ●01/27 03:40 Committee Specification〓3 December 2001 James Clark〓<jjc@jclark.com>, MURATA Makoto〓<EB2M-MRT@asahi-net.or.jp> Copyright 〓 The Organization for the Advancement of Structured Information Standards [OASIS] 2001. All Rights Reserved. pattern〓〓::=〓〓<element name=”QName”> pattern+ </element> param〓〓::=〓〓<param name=”NCName”> string </param> exceptPattern〓〓::=〓〓<ex