title: Generate Digital Signature but with a Specific Namespace Prefix ("ds:")
body: <p>I digitally sign XML files, but need the signature tags contain the namespace prefix "ds". I researched quite the google and found many of the same questions, but no satisfactory answer.</p>
  
  <p>I tried to put the "ds" manually in the file, but the signature becomes invalid. The tag "SignatureValue" signs the tag "SignedInfo" so the signature becomes invalid.</p>
  
  <p>Could somebody show me how I generate the value of the tag "SignatureValue" so I can replace the signature after adding the prefix "ds"?</p>