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The specification must describe how to use XML syntax to represent a signature
over digital content (and XML content in particular).
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XML-signatures are generated from a hash over a list of references and the
digest value of the references' content.
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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.
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The "P3P Assurance Profile" Note explores the question of adding semantics
to signatures.
