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An attribute declaration may be local to an attribute group definition, in which case its scope is specified as *absent*. But when the group is referenced in a complex type definition, the spec doesn't specify that it's scope is set to that of the complex type. There may be a similar problem for elements/element groups as well. See: http://lists.w3.org/Archives/Public/www-xml-schema- comments/2001OctDec/0209.html
*** This bug has been marked as a duplicate of 1884 ***