- From: by way of <Stefan.Wachter@gmx.de>
- Date: Thu, 15 Aug 2002 19:20:37 -0600
- To: W3C XML Schema Comments list <www-xml-schema-comments@w3.org>
Dear all, The complex type derivation with a simple content restriction allows an inlined simple type: <xs:complexType name="D"> <xs:simpleContent> <xs:restriction base="B"> <xs:simpleType> <xs:restriction base="xs:string"/> </xs:simpleType> </xs:restriction> </xs:simpleContent> </xs:complexType> In this situation the derived type D has two "base types": 1. The type B, that must be a complex type with simple content and 2. the built-in string type. Admittedly, "string" is not the base type of D but the base type of the content type of the derived type. In order that every valid instance of type D is also a valid instance of type B it must be ensured that the content type of D is a restriction of the content type of D. This is very difficult to check (think about pattern constraints!). In addition, there seems to be no mandatory reason why an inlined simple type definition is allowed in simple content restrictions. The simple content of the derived complex type can be restricted by facets in the usual way. Therefore I propose to cancel this feature, i.e. not to allow inlined simple types in simple content restrictions. Thanks for your attention, --Stefan
Received on Thursday, 15 August 2002 21:21:37 UTC