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The questions of how to represent passbacks (redoing) of work in a workflow and of what semantics to apply to passbacks comprise an important issue in workflow research. In this paper, cyclic workflows are regarded as workflows with passbacks, and the normal form of a workflow is defined from properties of workflows as graphs. For a normal workflow, semantics based on passbacks is defined as a transition...
Correctness of workflows is one of the most important properties for quality improvement of workflows. It is a consistency property of workflows on the control flow perspective. In this paper, we extend correctness property of acyclic workflows to that of acyclic workflows with multiple starts and/or ends. The extended correctness is a natural extension of the original correctness property. It is...
In this paper, we introduce an algorithm called "EVA" (Evidence Verification Algorithm), which verifies consistency of life cycles of evidence-documents in workflows. As syntax of workflows, we use extended UML activity diagrams, which have additional information about evidence-documents. EVA verifies the existence of consistent sequences of flows between occurrences of evidence-documents...
Plotkin and Abadi have proposed a syntactic system for parametricity based on a second order predicate logic. This paper shows three theorems about that system. The first is consistency of the system, which is proved by the method of relativization. The second is that polyadic parametricities of recursive types are equivalent to each other. The third is that the theory of parametricity for recursive...
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