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These models attempt to use networks of high-level object-oriented users to define processes (tasks).
The CM is based on iterations. Iteration can be interpreted as an event produced by one participant to the other. The iterations are represented by arrows, in which an actor produces an action against one or more recipients. Each iteration has its own content, which is represented as an object (data type). Each collaboration it is also a class, which can be instantiated numerous times.
A tool for representing CM is given by the sequence diagrams of UML 2.0. The sequence diagrams are binary and allow the existence of different control flows. The iterations are represented by arrows and the flow control can opt or alt (alternative among several possible messages. The condition of the answer may depend on data or events).

Processes of case
The processes of the case are processes instantiable, as each process is interpreted as a class instantiable multiple times. This fact makes the representation easier. If each process is instantiable, we should not handle the existence of multiple tokens of different subjects within the same process. The problem is to keep the links between instances and tokens, which is normally run of Engine.

B2B systems
The Business to Business B2b are systems, which require the cooperation of separate organizations. Contributions can be expressed by means of arrows, as in the case of intra-organzzativi. Change the logical meaning of the token, because they no longer have the significance of key / item, but they become messages (neutral information). Normally messages are written in an encoding known by both business (XML).
At a time when a message reaches a token is a business object product. Messages align the information systems of partners (so that they both have the same business transaction data).
The mapping of the messages we are not interested in objects and patterns that we have adopted up to now can be used even if B2B.
The models of collaboration in a B2B system define the communication protocol between the two companies.

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