Web services composition which provides a way to obtain value-added services is still a critical challenge especially for large scale semantic Web services. We propose an efficient automatic approach to composite services through three steps: 1) Preprocessing the given services and requestor to support composite types and inheritance relationships, 2) Building an And/Or graph to capture the input/output dependencies among the services within the scope of the given requestor, 3) Searching required services to meet the requestor and then obtaining the execution process. The experimental results about consuming time and success rate are presented.
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