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In order to find suitable Web services from a large collection of Web services, automatic support is needed to filter out Web services relevant according to some criteria specified by the user. In real business scenarios constraints on the types of input and output parameters are often not sufficient. Rather one wishes to specify constraints on relationships of input and output parameters, interaction pattern and non-functional properties of Web services. Therefore, there is a need for a moredoi:10.1109/wi.2007.49 dblp:conf/webi/Agarwal07 fatcat:le3rnubt3zabhd7hivefgiemni