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In the current CDL specification (Web Services Choreography Description Language Version 1.0, W3C Working Draft 27 April 2004) clause 2.1 Model Overview: The bullet : * Participants, Roles and Relationships - In a Choreography information is always exchanged between Participants, within the same or across trust boundaries is about Participants, Roles and Relationships but only mentions Participants I suggest amending to something like: * Participants, Roles and Relationships - In a Choreography information is exchanged by message passing between roles in different Participants, within the same or across trust boundaries. A Relationship is a named pairing of a role within a participant with another role in a different Participant. Best Regards Tony A M Fletcher