A subprocess is normally tightly-coupled with the calling process, i.e. (1) termination of the calling process results in termination of the subprocess, (2) unrecoverable faults are propagated from the subprocess to the calling process, and (3) the calling process can invoke the compensation activity of the subprocess. In the BPEL case, since processes are loosely-coupled Web services, the conventional form of a subprocess does not exist (yet).
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