Abstract. The ability to locate useful on-line Web Services is becoming critical for today's service-oriented business applications. A number of efforts have been put to enhance the service discovery process by using conceptualised knowledge, called ontology, of particular service domains to describe service characteristics. This paper presents an ontology-based approach to enhance descriptions of Web Services that are expressed in WSDL with ontology-based behavioural information, i.e. input, conditional/unconditional output, precondition, and conditional/unconditional effect of the services. Having a service ontology associated with each Web Service description, queries for services based on behavioural constraints can benefit from inferring semantics of the service from the service ontology. The service discovery process becomes closer to discovery by service semantics or behaviour, in contrast with discovery by matching of service attributes values -the mechanism that is supported currently by Web Services.

Abstract. This paper proposes an approach to behaviour-based discovery of Web Services by which business rules that govern service behaviour are described as a policy. The policy is represented in the form of ontological information and is based on actions relating to the service and conditions for performing them. The standard WS-Policy is used to associate such a policy to the Web Service. With a framework that extends standard discovery by UDDI, service consumers can query for Web Services by specifying business constraints. The policy of the Web Service will be evaluated against the consumer's query by using OWL ontology querying engine and a rule-based reasoning module. By considering business rules in addition to the conventional attribute-based search by UDDI, the approach will enable more satisfactory discovery results that better fit service consumers' requirements.

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