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I am still unconvinced that defining abstract choreographies is worth the effort. If they were not defined, no new syntax (or just a minimum amount) would be required for Types, Messages, Operations, Interactions/Channels, Reliability, Semantics, etc., since those constructs would already be available at the WSDL abstract level. (Corda)
the f2f meeting in march 2004 agreed that abstract without wsdl should not be addressed by the group.