2182 2005-09-14 18:45:37 +0000 R-189: Recursive simple type definitions 2009-04-21 19:21:35 +0000 1 1 1 Unclassified XML Schema Structures: XSD Part 1 1.0/1.1 both All All CLOSED FIXED resolved P2 normal --- 1 sandygao cmsmcq www-xml-schema-comments oldest_to_newest 6186 0 sandygao 2005-09-14 18:45:37 +0000 Is the following recursive definition valid? <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://foo.com" xmlns="http://foo.com" elementFormDefault="qualified"> <xsd:simpleType name="abcOrBoolean"> <xsd:union memberTypes="xsd:boolean abc"/> <xsd:simpleType> <xsd:simpleType name="abc"> <xsd:restriction base="abcOrBoolean"> <xsd:minLength value="5"/> <xsd:restriction> <xsd:simpleType> <xsd:schema> Henry's response: "Not allowed. There is an erratum forthcoming which is intended to clarify this, but, irritatingly, it doesn't catch the above case. I expect yet another erratum will do so." See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002OctDec/0124.html 6187 1 sandygao 2005-09-14 18:45:49 +0000 Discussed at the Feb. 7 concall. The WG agreed to classify R-189 as an error w/ erratum 15201 2 sandygao 2007-05-25 13:38:37 +0000 Discussed at 2007-05-18 telecon. Adopted the following proposal. - Require that members of a union type can't be the union type itself *or a type derived from it*.