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3.1.4.1 Supporting a Protocol Version

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A protocol role implementation that claims support for a protocol version MUST implement all the protocol elements required by that version for the respective role, as specified in section 2.2.1.

A protocol role implementation that claims a version as the maximum supported protocol version MUST support that version, and it MUST NOT implement any protocol elements that are neither required nor optional for that version (see section 2.2.1).