<attribute name="actuate">
    <annotation>
        <documentation>
        The 'actuate' attribute is used to communicate the desired timing 
        of traversal from the starting resource to the ending resource; 
        it's value should be treated as follows:
        onLoad - traverse to the ending resource immediately on loading 
                 the starting resource 
        onRequest - traverse from the starting resource to the ending 
                    resource only on a post-loading event triggered for 
                    this purpose 
        other - behavior is unconstrained; examine other markup in link 
                for hints 
        none - behavior is unconstrained
      </documentation>
    </annotation>
    <simpleType>
        <restriction base="string">
            <enumeration value="onLoad" />
            <enumeration value="onRequest" />
            <enumeration value="other" />
            <enumeration value="none" />
        </restriction>
    </simpleType>
</attribute>