Interaction

A unique association between a specific Composite Message Type, a particular Trigger Event that initiates or "triggers" the transfer, and the responsibilities the receiver must execute upon receipt of the information. It is a unique, one-way transfer of information.

A single Interaction explicitly answers the questions:

• How a system knows when to send a particular type of message;
• What the particular message type is;
• What the receiving system should do when receiving the message.

As the list above indicates, each Interactions is defined as a triplet involving the following elements:

• Trigger Event - each interaction will be associated with a single trigger event. The trigger event represents the “real-world” occurrence that creates a need to exchange information. Note that a given trigger event may fire multiple interactions.

Note that the semantic context of an interaction has to be defined by a domain.

• Composite Message Type – The set of static model definitions (wrappers and message types) that define the structures of the data that is transmitted by the interaction.
• Receiver Responsibilities - will be defined for the target receiver of the message. The receiver responsibilities will be cast in terms of one of several interactions to be sent as a result of receiving the message and/or as one trigger event out of a set of trigger events the receiver will fire after receipt of the message. It is possible that the responsibility option interaction will itself have receiver responsibilities, resulting in a prolonged conversation between sender and receiver.