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If a schema declares an attribute with a default value of type QName (a="b:c"), there is no validation of the fact that the prefix "a:" is bound in the instance document at the point where the default value is applied. See Ashok's mail on behalf of XSL at: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Jan/0067.html
Discussion at the 01/25 telecon: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Jan/0084.html And 08/26/2005 telecon: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2005Aug/0070.html Defer to a future revision of the specification.