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The Efficient XML Interchange Working Group has published a W3C Recommendation of Canonical EXI. This specification describes a relatively simple method for generating a physical representation, the canonical form, of an EXI document that accounts for the permissible differences. An example of the applications targeted by this specification is one that needs to guarantee non-repudiation using XML Signature yet allows certain flexibility for intermediaries to reconstitute the documents before they reach final destination without breaking the signatures. Note that two documents may have differing canonical forms yet still be equivalent in a given context based on more elaborate application-specific equivalence rules which is out of scope of this specification.


Publication – W3C News