Adding the `ds` prefix to the signature and descendants.

[hanadderia]

Hello,

I am currently working on signing some XML files and have encountered a couple of issues that I need assistance with. Specifically, I am unable to add the ds prefix to the signature and its descendants, and I am also having difficulty removing the URI from the empty references. These modifications are necessary for validation against the schema. I managed to add the prefix but it can't be verified.

Could you please advise if it is possible to implement these changes?

Thank you for your assistance.