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

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10.2. XML Signature Syntax

This section describes the XML digital signature syntax and discusses formal DTD and schema syntaxes as alternative descriptions of it. A certain context is assumed for the DTDs and schemas that appear in later subsections. In particular, the DTD context is assumed to be as follows:

 <!-- XMLDSIG DTD context --> <!-- The following entity declarations enable external/flexible content in the Signature content model. #PCDATA emulates schema:string; when combined with element types it emulates schema mixed="true". % foo.ANY permits the user to include their own element types from other namespaces, for example: <!ENTITY % KeyValue.ANY '| ecds:ECDSAKeyValue'> ... <!ELEMENT ecds:ECDSAKeyValue (#PCDATA) > --> <!ENTITY % Object.ANY ...

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