The Signature Element

<Signature> 
     <SignedInfo>
       (CanonicalizationMethod)
       (SignatureMethod)
       (<Reference (URI=)>
         (Transforms)
         (DigestMethod)
         (DigestValue)
       </Reference>)
     </SignedInfo>
     (SignatureValue) 
    (KeyInfo)
    (Object)
</Signature>