OpenID Delegating relationship in XRD

<XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0" xml:id="foo">
    <Expires>1970-01-01T00:00:00Z</Expires>
    <Subject>http://sakimura.org/nat</Subject>
    <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> 
      ....
    </ds:Signature>
    <Link>
        <Rel>http://openid.net/rel/my_op</Rel>
        <URI>http://myop.com/#</URI>
    </Link>
</XRD>