2057 2005-09-09 02:33:55 +0000 R-068: Contradiction in Structures re: base for complexTypes with simpleContent 2009-04-21 19:24:56 +0000 1 1 1 Unclassified XML Schema Structures: XSD Part 1 1.0 only All All CLOSED FIXED P2 normal --- 1 sandygao ht www-xml-schema-comments oldest_to_newest 5923 0 sandygao 2005-09-09 02:33:55 +0000 There appears to be a contradiction in Structures as to whether a complexType with simpleContent is allowed to be derived by restriction from a mixed type. The property mapping rules for complex type with simple content state the following for content type when restriction is chosen: "1 if the type definition resolved to by the actual value of the base [attribute] is a complex type definition (whose own {content type} must be a simple type definition, see below) and the restriction alternative is chosen ...". In addition, Schema Representation Constraint: Complex Type Definition Representation OK states: "If the <simpleContent> alternative is chosen, the type definition resolved to by the actual value of the base [attribute] must be either a complex type definition whose {content type} is a simple type definition or, only if the <extension> alternative is also chosen, a simple type definition; " However, "Schema Component Constraint: Derivation Valid (Restriction, Complex)" states: "5.1 If the {content type} of the complex type definition is a simple type definition, then one of the following must be true: 5.1.1 The {content type} of the {base type definition} must be a simple type definition of which the {content type} is a valid restriction as defined in Derivation Valid (Restriction, Simple). 5.1.2 The {base type definition} must be mixed and have a particle which is emptiable as defined in Particle Emptiable). " See: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2001Jun/0047.html 5924 1 sandygao 2005-09-09 02:34:50 +0000 Henry's response http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2001Jun/0050.html Further discussion at the Dec f2f: http://www.w3.org/XML/Group/2001/12/xml-schema-ftf-minutes.html#ab1b3b3c11b2 Status 01/2002: Discussion to be postponed until after R-54 is resolved. See minutes: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Jan/0080.html Discussion resumed on April 16: http://lists.w3.org/Archives/Member/w3c-xml-schema-wg/2002Apr/0022.html Resolution: Resolved at the May f2f. The WG decided to instruct the editor to draft erratum, correcting any text which conflicts with 5.1.2 above. Draft errata posted at: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Oct/0201.html Discussed and approved at Oct. f2f. See: http://www.w3.org/XML/2002/10/xml-schema-ftf-minutes Erratum E1-27 added.