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Automatic Web services composition can be achieved by using AI planning techniques. HTN planning has been adopted to handle the OWL-S Web service composition problem. However, existing composition methods based on HTN planning have not considered the choice of decompositions available to a problem which can lead to a variety of valid solutions. In this paper, we propose a model of combining a Markov decision process model and HTN planning to address Web services composition. In the model, HTNdoi:10.1109/icws.2009.43 dblp:conf/icws/ChenXR09 fatcat:fxsybxwpcngaja5xjo3hbauv5y