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The()is a general description of  the architecture of a workflow management system  used  by  the WFMC,  in which  the main  components  and  the  associated  interfaces  are summarized.The workflow enactment service is the heart of a workflow system which consists of several().In a workflow system, a process is specified using the process definition tool.Usually, processes  are  defined  in terms of  a(), which consists  of()indicated using a circle, and()shown as a rectangle.These two components can be linked by means of a directed arc.