modify default reference

[SergioSG-PNXT]

its possible modify or add a transform in the Signature in the default reference?

    <ds:Reference Type="http://uri.etsi.org/01903#SignedProperties" URI="#xades-id-123456">
      <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
      <ds:DigestValue>xxxxxxxxxxxxxxxxxxx</ds:DigestValue>
    </ds:Reference>

[fmoessle]

Any updates?