<attributeGroup name="AssociationAttributeGroup">
    <annotation>
        <documentation>

        These attributes can be attached to any element, thus allowing it 

        to act as a pointer. The 'remoteSchema' attribute allows an element 

        that carries link attributes to indicate that the element is declared 

        in a remote schema rather than by the schema that constrains the 

        current document instance.  

      </documentation>
    </annotation>
    <attributeGroup ref="xlink:simpleLink" />
    <attribute ref="gml:remoteSchema" use="optional" />
</attributeGroup>