Key points are not available for this paper at this time.
This paper is based on the theory of Finite State Automata (FSA's), models a web service as a FSA, extends WSDL for conceptually describing the behaviors of Web services, and introduces the concept of Temporal Logic of Actions (short for TLA) to describe and specify the behavior of a service in a formal way.
Wang et al. (Thu,) studied this question.