A Petri net model for temporal knowledge representation and reasoning - Comment

Abstract

In the above paper(1), Yao has presented a unified time Petri net model (TPN) for temporal knowledge representation and reasoning, where the TPN model presented has a good contribution in the aspect of temporal knowledge representation and reasoning, However, there are a number of errors which should be corrected. The purpose of this paper is to identify these errors, and the corrections provided permit the readers who have been confused by the errors to gain a better understanding of the good ideas presented.