<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
              xmlns:xlink="http://www.w3.org/1999/xlink"
              targetNamespace="http://www.w3.org/1999/xlink"
              elementFormDefault="qualified"
              attributeFormDefault="unqualified">
<xs:attribute name="href" type="xs:anyURI"/>
<xs:attributeGroup name="simpleAttrs">
    <xs:attribute ref="xlink:href"/>
</xs:attributeGroup>
</xs:schema>
