Abstract
The correctness of workflow systems is dependent on not only their control-flows but also their data-flows. <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">WFD-nets</i> (Workflow net with data) can model both control-flow and data-flow of workflow systems, and are used to analyze/verify their correctness. The existing methods of analyzing/verifying WFD-nets are based on their reachability graphs. However, the reachability-graph-based methods have two flaws: state space explosion and pseudo states, since the guard functions are not handled perfectly. Note that every transition of a WFD-net is labeled by a guard function, which is a Boolean expression <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">w.r.t.</i> data and can determine the progress of control-flow. In order to solve these problems, we propose a <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">guard-driven reachability graph</i> that can both alleviate the state space explosion problem and avoid pseudo states. We describe the related algorithms and develop a tool. A group of experiments illustrate the advantage and effectiveness of our approach, and an example of property loan shows its usefulness.
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