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Conceptual Model – Service Model Class – Process Classification
- Atomic Processes
- directly invocable (by passing them the appropriate messages),
- no subprocesses and execute in a single step,
- they take an input message, do something, and then return their output message,
- provided a grounding that enables a service requester to construct messages to the process from its inputs and deconstruct replies
- Simple processes
- not invocable and are not associated with a grounding,
- conceived of as having single-step executions
- used as elements of abstraction
- used to provide a view of (a specialized way of using) some atomic process
- simplified representation of some composite process (for purposes of planning and reasoning)
- Composite processes
- decomposable into other (non-composite or composite) processes,
- their decomposition can be specified by using control constructs such as Sequence and If-Then-Else
- a composite process is not a behavior a service will do, but a behavior (or set of behaviors) the client can perform by sending and receiving a series of messages
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