<Reference xmlns="http://www.w3.org/2000/09/xmldsig#" xmlns:foo="http://example.org/foo" Id="reference-2" URI="#reference-1">
          <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"></DigestMethod>
          <DigestValue>qURlo3LSq4TWQtygBZJ0iXQ9E14=</DigestValue>
        </Reference>