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In the namespace fixup rules in 3.4.5.1 Attribute Default Value, rule 1 says: If the [in-scope namespaces] of E contains a binding for N, no namespace fixup is needed; the properties of E are not changed. This is only true if the binding is a non-default binding, that is, if it binds a specific prefix. A binding of the default namespace is no use. I suggest changing "contains a binding for N" to "binds a prefix to N".
During its 2009-01-23 telecon, the schema WG adopted a proposal to address this issue. The proposal (along with other changes) can be found at (member-only): http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.omni.20090123.html The change is identical to what was suggested in the bug report. With this change, the WG believes that the issue raised in this bug report is addressed. I'm marking this RESOLVED accordingly. Michael, if you would indicate your concurrence with or dissent from the WG's disposition of the comment by closing or reopening the issue, we'll be grateful. If we don't hear from you in the next two weeks, we'll assume that silence implies consent.