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In the Microsoft Particles test set, test <test group="particlesIg004" name="particlesIg004"/> the schema is described in the metadata as invalid. However, I cannot see any reason why it should be considered invalid. Comments in the metadata hint that the essence of the test hinges on whether the particle <xsd:element name="e1" block="substitution extension restriction"/> is a valid restriction of <xsd:element name="e1" block="#all"/> I think that it is.
This issue in the test suite in due to a corresponding issue in the Microsoft Schema processors. The fix will be addressed in a future release. Agreed that the test case should be changed to 'valid'.
Sandy Gao wrote: <Sandy> [It's the constraint "NameAndOK"] <Sandy> [for elements block="#all" is the same as block="substitution extension restriction"] <Sandy> [yes, the spec is clear, and the derivation is valid.] WG resolved to change metadata to expect a "valid" result.