Using Object: Adding Timestamp

<Signature Id="MySignature" ...>
  <SignedInfo>  
    ...  
    <Reference URI="something">   
    ... 
    <Reference URI="#MyTimeStamp"  
        Type="http://www.w3.org/2000/09/xmldsig#SignatureProperties">  
    ...
    </Reference>    
  </SignedInfo>  
  ...  
  <Object> 
    <SignatureProperties> 
      <SignatureProperty Id="MyTimeStamp" Target="#MySignature"> 
        <t:timestamp xmlns:t="http://www.ietf.org/rfcXXXX.txt">  
          <t:date>19990908</t:date>  
          <t:time>14:34:34:34</t:time>  
        </t:timestamp>  
      </SignatureProperty> 
    </SignatureProperties> 
  </Object>  
</Signature>

Note: by adding the reference to MyTimeStamp, the timestamp is also signed!