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Is the following invalid? <xsd:element name="root"> <xsd:complexType> <xsd:sequence> <xsd:element name="Book" maxOccurs="unbounded"> <xsd:complexType> <xsd:sequence> <xsd:element name="isbn" type="xsd:string"/> <xsd:sequence> <xsd:attribute name="name" type="xsd:string" use="required"/> <xsd:complexType> <xsd:key name="BookKey"> <xsd:selector xpath="."/> <xsd:field xpath="isbn"/> <xsd:key> <xsd:element> <xsd:sequence> <xsd:complexType> <xsd:element> The point to note here is that the selector XPath contains the expr '.' The XMLSchema Rec says: [[ {selector} specifies a restricted XPath ([XPath]) expression relative to instances of the element being declared. This must identify a node set of subordinate elements (i.e. contained within the declared element) to which the constraint applies. ]] Further, 3.11.4 The Identity-constraint Definition Validation Rules, states: [[ Validation Rule: Identity-constraint Satisfied For an element information item to be locally valid with respect to an identity- constraint all of the following must be true: 1 The {selector}, with the element information item as the context node, evaluates to a node-set (as defined in [XPath]). [Definition:] Call this the target node set. 2 Each node in the target node set is an element node among the descendants of the context node. 3 .... ]] Looking at point 2 above, it reflects that, '.' cannot be used as the XPath expr for a selector. Does *descendants of the context node* include the context node? On the other hand the production rule for the XPath expr for the selector allows '.' as a valid XPath expr. A clarification is requested. See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0014.html
Henry's response: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0024.html Resolution: Discussed at the May 23 telecon: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002May/0091.html Resolved to classify R-136 as an error and instruct editor to draft erratum. Proposed text: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Oct/att-0225/01-R- 161etc.html Reviewed and approved at the Oct. 24 telecon. See: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Oct/0248.html Erratum E1-35 added.