SignedInfo


  <SignedInfo> ; scope of sig processing
    <CanonicalizationMethod ; for SignedInfo
      Algorithm="http://www.w3.org/.../xml-c14n"/>
    <SignatureMethod Algorithm="dsig:dsaWithSHA-1"/> 
    <ObjectReference URI="http://www.myhome.com" ; points to object
     ...
    </ObjectReference>
    <ObjectReference IDREF="#timestamp" ; points to object
     ...
    </ObjectReference>
  </SignedInfo>