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Requirement: specify relation of XML Schema 1.1 to XML 1.1. (For full description see entry in old 1.1 requirements list at http://www.w3.org/XML/Group/2002/07/xmlschema-1.1-current-reqs-list.html#xml1.1) The WG decided in May 2005 to align XML Schema 1.1 with XML 1.1; in July, a WG member asked to reopen the decision (http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2005Jul/0046.html).
On 27 January 2006 the WG adopted a proposal to make it implementation-defined whether schema software supports the XML- and Namespaces-dependent types using the definitions of NCName, Char, etc. found in 1.0 of those specifications, or the definitions found in 1.1, or both. Similarly, when schema validity assessors read XML as input (as opposed to DOM trees or some other representation of the infoset, where version information may be unavailable), support for 1.0, 1.1, or both is implementation defined. In the case of the datatypes, it is recommended that the choice of which flavor of the datatypes to use should be under user control. In the case of XML input, it is said only that the choice may be under user control. The WG also agreed that we should augment the PSVI to show which version of the relevant types was used; that will be tracked in another issue.
The underlying issue applies to both Structures and Datatypes. This Bugzilla entry is for Datatypes; see bug 3048 for the entry for Structures.