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Although web services are generally envisioned as being stateless, some of them are implicitly stateful. The reason is that the web services often work as front-ends to enterprise systems and are used in a session-oriented way by the clients. Contrary to the case of stateless services, for a stateful web service there exist constraints to the order in which the operations of the service may be invoked. However, specification of such constraints is not a standard part of a web service interface,doi:10.1109/seaa.2008.11 dblp:conf/seaa/ParizekA08 fatcat:tyeygif3cjhibletsf5bohyo4e