docbook.xsd contains:
<xs:attributeGroup name="db.common.linking.attributes">...
<xs:attribute ref="xlink:type"/>
<xs:attribute ref="xlink:role"/>
and several docbook element definitions contain
<xs:element name="...">
<xs:complexType mixed="true">
...
<xs:attribute name="role"/> <!-- or name="type" -->
<xs:attributeGroup ref="docbook:db.common.linking.attributes"/>
</xs:complexType>
</xs:element>
which, although unusual, is technically correct since one attribute is
in namespace "http://docbook.org/ns/docbook"; and the other one in
"http://www.w3.org/1999/xlink";.
But it is apparent from the docbook spec that this is unintentional
and therefore I think that the redundant <xs:attribute> elements
should be omitted. Is this correct?
-W
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