An Extensible Process Server Component and its Integration into Heterogeneous Process-Centered Environments

We present a process server component with extensible syntax and semantics. New process en-actment directives can be added to the syntax of the process modeling language, which we deem a \process assembly language" because it supports translation from higher-level process formalisms for enactment by the \process virtual machine", or process engine. The process engine is param-eterized by callbacks to instance-speciic mediator code in order to implement any new directives and to modify the default enactment behavior. The mediator architecture also enables integration with a wide variety of existing environment architectures, including adding on process to an environment without such a facility, replacement of an existing process engine, and interop-erability with an existing process system.