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Within an xs:anyAttribute element, the keyword ##definedSibling is permitted to appear. Yet it appears to have no effect. So why allow it?
WG agrees this might be helpful. But a change to the S4S may be required, and other side effects may make this bug difficult to resolve.
On 2008-10-24, the working group adopted a proposal to address this issue by disallowing ##definedSibling in attribute wildcards. The proposal (along with changes for other bugs) can be found at (member-only): http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.omni0810.html