Naveen Srinivasan

Bringing semantics to web services: the OWL-S approach

Service interface description languages such as WSDL, and related standards, are evolving rapidly to provide a foundation for interoperation between Web services. At the same time, Semantic Web service technologies, such as the Ontology Web Language for Services (OWL-S), are developing the means by which services can be given richer semantic specifications. Richer semantics can enable fuller, more flexible automation of service provision and use, and support the construction of more powerful tools and methodologies. Both sets of technologies can benefit from complementary uses and cross-fertilization of ideas. This paper shows how to use OWL-S in conjunction with Web service standards, and explains and illustrates the value added by the semantics expressed in OWL-S.

Automated Discovery, Interaction and Composition of Semantic Web Services

In this paper we introduce a vision for Semantic Web Services, which combine the growing Web services architecture and the Semantic Web and we will propose DAML-S as a prototypical example of an ontology for describing Semantic Web services.

Bringing Semantics to Web Services with OWL-S

Current industry standards for describing Web Services focus on ensuring interoperability across diverse platforms, but do not provide a good foundation for automating the use of Web Services. Representational techniques being developed for the Semantic Web can be used to augment these standards. The resulting Web Service specifications enable the development of software programs that can interpret descriptions of unfamiliar Web Services and then employ those services to satisfy user goals. OWL-S (“OWL for Services”) is a set of notations for expressing such specifications, based on the Semantic Web ontology language OWL. It consists of three interrelated parts: a profile ontology, used to describe what the service does; a process ontology and corresponding presentation syntax, used to describe how the service is used; and a grounding ontology, used to describe how to interact with the service. OWL-S can be used to automate a variety of service-related activities involving service discovery, interoperation, and composition. A large body of research on OWL-S has led to the creation of many open-source tools for developing, reasoning about, and dynamically utilizing Web Services.

An efficient algorithm for OWL-S based semantic search in UDDI

The increasing availability of web services demands for a discovery mechanism to find services that satisfy our requirement. UDDI provides a web wide registry of web services, but its lack of an explicit capability representation and its syntax based search provided produces results that are coarse in nature. We propose to base the discovery mechanism on OWL-S. OWL-S allows us to semantically describe web services in terms of capabilities offered and to perform logic inference to match the capabilities requested with the capabilities offered. We propose OWL-S/UDDI matchmaker that combines the better of two technologies. We also implemented and analyzed its performance.

Dynamic discovery and coordination of agent-based semantic Web services

We describe about dynamic discovery and coordination of agent-based semantic Web services. Matchmaking and brokering are multiagent coordination mechanisms for Web services. Both have performance trade-offs, but the Web Ontology Language for Semantic Web Services (OWL-S) can handle extensions that address some of the shortcomings. We focus on the broker, analyzing both its interaction protocol and reasoning tasks. We also describe OWL-Ss exec extensions, detail their implementations basic features, and explain how these features address the brokers reasoning problems.

Semantic Web Service Discovery in the OWL-S IDE

The increasing availability of web services necessitates efficient discovery and execution framework. The use of xml at various levels of web services standards poses challenges to the above process. OWL-S is a service ontology and language, whose semantics are based on OWL. The semantics provided by OWL support greater automation of service selection, invocation, translation of message content between heterogeneous services, and service composition. The development and consumption of an OWL-S based web service is time consuming and error prone. OWL-S IDE assists developers in the semantic web service development, deployment and consumption processes. In order to achieve this the OWL-S IDE uses and extends existing web service tools. In this paper we will look in detail at the support for discovery for semantic web services. We also present the matching schemes, the implementation and the results of performance evaluation.

The DAML-S virtual machine

This paper introduces the DAML-S Virtual Machine (DS-VM): an embedded component that uses the DAML-S Process Model to control the interaction between Web services. We provide a proof of the validity of the implementation of the DAML-S Virtual Machine by proving a mapping from the rules used by the DS-VM to the DAML-S Operational Semantics. Finally, we provide an example of use of the DS-VM with a DAML-Sized version of Amazon.coms Web service, and we conclude with an empirical evaluation that shows that the overhead required by the DS-VM during the interaction with Amazon is only a small fraction of the time required by a query to Amazon. The DS-VM provides crucial evidence that DAML-S can be effectively used to manage the interaction between Web Services.

Discovery of information sources across organizational boundaries

In this paper we propose an extension of the service oriented architecture that supports discovery of Web services across organization boundaries. We provide a detailed discussion of both the architectural and implementation considerations, and we provide an empirical evaluation that shows that indeed our prototype implementation scales with both the number of Web services and the number of organizations involved.