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The model component contains a compiler and a process definition registry, used by the workflow engine in order to create process instances and manage in/out messages. The compiler must be able to generate an execution graph composed of the behaviors defined above.
For instance, the WS-BPEL defines *ForEach* and *While* activities. These BPEL activities generate nodes with *Loop* behaviors.

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!EasyVIPERModel.png|border=1!
SCA Model of the EasyVIPER Workflow Model.
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