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Define MEP as a choreography then use (compose) this with others to form a higher-level choreography. Alternatively we could just view an MEP as a pattern that a Web Service will do. A possible definition of an MEP might include binding to Web Services, whereas Choreography is above that and does not include an explicit binding except for a binding to MEPs. It was suggested that may be at this stage we needed to have some creative ambiguity in this area until WSDL 1.2 is fixed.
an MEP is not a choreography as a choreography contains more than than just message exchanges (such as guards, composition)