- The specification must describe how to use XML syntax to represent a signature over
digital content (and XML content in particular).
- XML-signatures are generated from a hash over a list of references and the digest value
of the references' content.
- The meaning of a signature is simple: The XML-signature syntax associates the
content of resources listed with a key via a strong one-way transformation.
- How to specify location independent signatures has been the hottest issue of late.