Abstract
Time constraints play a very important role in realtime systems, in this paper local time constraints are converted to global time constraints according to token's movement from one place to another in the workflow Petri net. Firstly, temporal reasoning method of three basic workflow patterns based on Petri net is presented, so that the global time constraint formula for each pattern is obtained. Finally, an application example for information system of administration and service for Tangshan urban-rural integration model is introduced. The example shows that global time constraints can effectively solve the problem of the workflow exceptions.
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