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1. There are components in the test suite that are not listed here in Bugzilla. I have therefore been obliged to misclassify this bug against the NIST tests. 2. In snbranch.xsd, notQname should be notQName. I have taken the liberty of correcting this in CVS. 3. Instance document snn1a is described as invalid. I can't see any reason for this. It claims to be something to do with substitution groups, but the only element that can substitute for another is s1, and this plays no further role in either the schema or the instance. 4. Conversely, snn1c is described as valid, but as far as I can see, it doesn't satisfy the content model, for reasons quite unconnected with #definedSibling.
Reclassified component.
*** Bug 14173 has been marked as a duplicate of this bug. ***
bug 14173 has additional important information.
old: <xsd:element name="n1" type="xsd:string"/> new: <xsd:element name="n1" type="xsd:string" substitutionGroup="tns:n"/>
Fixed in CVS.