One popular use of a Message Registry is to be a catalog of Message definitions that are used to validate incoming messages. In these scenarios, the receiver of a message might need to "match" it to the corresponding Message definition that the message is meant to adhere to. This specification does not mandate how this "matching" is done. For example, matching headers or schema of the incoming message to the Message definitions in the Registry is one option.
In a Registry with many Message definitions, and each one of those having