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2. A. Ankolenkar, M. Burstein, T. Cao Son, J. Hobbs, O. Lassila, D. Martin, D. McDermott, S. McIlraith, S. Narayanan, M. Paolucci, T. Payne, K. Sycara, H. Zeng, DAML-S: Semantic Markup For Web Services, http://www.daml.org/services/daml-s/2001/10/daml-s.html.
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