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The "Conformance" section of all our specs has the following paragraph: "For any message defined by this specification, any OPTIONAL elements or attributes in the message MAY be used by senders of the message, however receivers of those messages MUST understand those OPTIONAL elements and attributes, unless other behavior is explicitly defined by this specification." It's not clear that "MUST understand" means that the receiver must support the OPTIONAL elements and attributes. Proposal: "For any message defined by this specification, any OPTIONAL elements or attributes in the message MAY be used by senders of the message, however receivers of those messages MUST support those OPTIONAL elements and attributes, unless other behavior is explicitly defined by this specification."
2009-11-17 resolved as proposed
Please make my changes