dsig:Syntax

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