Wikimedia Bugzilla is closed!

Created attachment 10249 [details]
The ns element should be nonNegativeInteger, not positiveInteger

The export format XSD defines the <ns> element as

    <!-- Namespace in canonical form -->
    <element name="ns" type="positiveInteger"/>

But, as a namespace quite often (;-)) is zero, which is _not_ a positive integer (and is not accepted for xs:positiveInteger, see http://www.w3.org/TR/xmlschema-2/#positiveInteger), this is wrong, an XML file using “<ns>0</ns>” does not validate. You want to use nonNegativeInteger instead.