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Subject: RE: [ebxml-cppa] SMTP Needs "to" and "from" e-mail addresses
Dale Moberg said: "I expect the conventions for xmldsig certificate usage to follow what is done for smime, but those usage conventions are only now emerging." Dan Weinreb commented: "Hmm. If we intend for the certificates used in ebXML to have DN's with an "e-mailAddress" component, it seems as if we really have to either say that explicitly, or say it by means of a normative reference to something else that says it explicitly. Since we're not basing ebXML on S/MIME, we can't draw on the S/MIME standards for this. I don't know whether this is something that we ought to specify explicitly in our own standards documents, or whether it's something that xmldsig ought to be talking about and we ought to be referring to." Dale Moberg: Could this level of detailed profiling be one to offload to an implementation guide document, perhaps produced under the Oasis ebxml-IIC group? I imagine that interoperability trials, API development, and pilot experience will, as usual, reveal the need for more detailed conventions on these matters. The CPPA group, for example, will have to eventually develop a demaraction for what modules can just be regarded as "interoperable in practice" in order to avoid diving into every possible parameter choice. For example, CPPA now treats SSL v3 or TLS v1 as being about at the "bottom" when documenting transport security, because these protocols do have mandatory to implement default fallback algorithms that "should" allow different implementations to work together without further deliberate configuration. XMLDsig does have similar features, but as the recent whitespace issue in ebXML messaging shows, they are probably not done with defining canonicalizing transforms yet, and CPPA has marking agreed transforms as one of its v1.1 issues. Dale Moberg
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