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>

• SignedInfo does not necessarily include KeyInfo  nor an explicit SignatureAttributes element. Instead, use an additional ObjectReference to an Object that includes these semantics.
• Canonicalization is contentious with respect to SignedInfo. Presently, no mandatory to use, perhaps a simple mandatory to implement.
• Entropy: XML is redundant with lots of static text, Canonical XML (with namespaces expanded) is even more so.