This schema document provides attribute declarations and
attribute group, complex type and simple type definitions which can be used in
the construction of user schemas to define the structure of particular linking
constructs, e.g.
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xl="http://www.w3.org/1999/xlink">
<xs:import namespace="http://www.w3.org/1999/xlink"
location="http://www.w3.org/1999/xlink.xsd">
<xs:element name="mySimple">
<xs:complexType>
...
<xs:attributeGroup ref="xl:simpleAttrs"/>
...
</xs:complexType>
</xs:element>
...
</xs:schema>