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2003 Technical Reports

Does Dead-Path-Elimination have Side Effects?

Franck van Breugel and Mariya Koshkina

Technical Report CS-2003-04

York University

April 2003

Abstract

Dead-path-elimination (DPE) can be viewed as a garbage collection strategy used in the business process execution language for web services (BPEL4WS). In this paper, we introduce a small language called the BPE-calculus which contains those constructs of BPEL4WS that are most relevant to DPE. We present two models for the BPE-calculus: one without DPE and one with DPE. We formulate a condition, named SEF, and show that it is sufficient and necessary for DPE being free of side effects. More precisely, we prove the following two properties. First of all, if the condition is satisfied, then the behaviour of a BPE-process is the same in both models. Secondly, if the condition SEF is not satisfied, then we can construct a BPE-process that behaves differently in the two models.

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