@inproceedings{CastagnaGesbertPadovani08,
  volume = {43},
  author = {Giuseppe Castagna and Nils Gesbert and Luca Padovani},
  issue = {1},
  series = {ACM SIGPLAN Notices},
  booktitle = {Proceedings of the ACM SIGPLAN-SIGACT Symposium on Principles of
               Programming Languages (POPL'08)},
  url = {http://www.di.unito.it/~padovani/Papers/filtered_contracts.pdf},
  abstract = { Contracts are behavioural descriptions of Web services. We devise
              a theory of contracts that formalises the compatibility of a
              client to a service, and the safe replacement of a service with
              another service. The use of contracts statically ensures the
              successful completion of every possible interaction between
              compatible clients and services. The technical device that
              underlies the theory is the definition of filters, which are
              explicit coercions that prevent some possible behaviours of
              services and, in doing so, they make services compatible with
              different usage scenarios. We show that filters can be seen as
              proofs of a sound and complete subcontracting deduction system
              which simultaneously refines and extends Hennessy's classical
              axiomatisation of the must testing preorder. The relation is
              decidable and the decision algorithm is obtained via a
              cut-elimination process that proves the coherence of
              subcontracting as a logical system. Despite the richness of the
              technical development, the resulting approach is based on simple
              ideas and basic intuitions. Remarkably, its application is mostly
              independent of the language used to program the services or the
              clients. We also outline the possible practical impact of such a
              work and the perspectives of future research it opens. },
  title = {{A Theory of Contracts for Web Services}},
  publisher = {ACM},
  doi = {10.1145/1328438.1328471},
  year = {2008},
  pages = {261-272},
}

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