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This issue was originally reported by Jane Hunter (MPEG-7). Key constraints to restrict which element types can be pointed to: Allow a schema author use key constaints to specify that a value (which otherwise behaves like an SGML or XML ID) is restricted to pointing at one (or more) particular element type(s)? See (member-only link) http://www.w3.org/XML/Group/xmlschema-current/lcissues.html#typed-refs (http://www.w3.org/XML/Group/xmlschema-current/lcissues.html#typed-refs) : LC-151. Input from Straw Poll O-10 Discussion at http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Nov/0127.html http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Nov/0129.html http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Nov/0131.html
WG discussed on 2007-03-28 f2f, resulting in the realization that the existing IDC mechanism actually fulfills the stated use case. Closing as FIXED.
This issue was first raised by Jane Hunter, then of DSTC Pty in Brisbane. A response has been sent to her (at a new email address); a copy may be found at http://lists.w3.org/Archives/Public/www-xml-schema-comments/2007AprJun/0048.html