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Secure XML: The New Syntax for Signatures and Encryption by Kitty Niles, Donald E. Eastlake

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19.2. Transformation Algorithms

A Transform element appears as the child of the Transform element, which in turn can appear as the child of a Reference, RetrievalMethod, or CipherReference. (See Figure 19-1.) As implicit input, these elements take the output of their previous Transform sibling or, if none exists, the data obtained by dereferencing the URI attribute of their parent.

The Transform element, while identical in structure in XML Signature and XML Encryption, is considered, for those recommendations, different and to reside in their respective different namespaces. The Transform element, however, is always found in the XML Signature namespace. ...

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