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We propose a composability model to ascertain that Web services can safely be combined, hence avoiding unexpected failures at runtime. Composability is checked through a set of rules organized into four levels: syntactic, static semantic, dynamic semantic, and qualitative levels. We introduce the concepts of composability degree and \tau{\hbox{-}}composability to cater for partial and total composability. We also propose a set of algorithms for checking composability. Finally, we conduct a performance study (analytical and experimental) of the proposed algorithms.
Index Terms- Web service, semantic Web, ontology, service composition, composability.

B. Medjahed and A. Bouguettaya, "A Multilevel Composability Model for Semantic Web Services," in IEEE Transactions on Knowledge & Data Engineering, vol. 17, no. , pp. 954-968, 2005.
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