Showing papers by "David Martin published in 2004"

Bringing semantics to web services: the OWL-S approach

Abstract: 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.

Deductive Question Answering from Multiple Resources.

Abstract: Questions in natural language are answered by consulting multiple sources and inferring answers from information they provide. An automated deduction system, equipped with an axiomatic application-domain theory, serves as the coordinator for the process. Sources include data bases, Web pages, programs, and unstructured text. Answers may contain text or visualizations. Although the approach is domain-independent, many of our experiments have dealt with geographic questions.

OWL-S and Agent-Based Systems

Abstract: Over the last decade, research in agent-based systems (ABS) has spawned a multi-faceted field, addressing a broad range of challenges and generating a varied array of technical approaches. Web service technologies, in contrast, have arisen in a more incremental fashion, with more modest aims, although the vision statements associated with Web services sometimes overlap significantly with those of ABS. Work on Semantic Web services aims to provide richer specifications of services, so as to enable fuller, more flexible automation of service provision and use, support the construction of more powerful tools and methodologies, and promote the use of semantically well-founded reasoning about services. This chapter provides an overview of OWL-S, a Semantic Web services ontology, and discusses its connections with work on agent-based systems. We argue that OWL-S takes some significant, although limited, steps towards a foundation for the deployment of agent technologies on the Web.

Extending Web Services Technologies

Abstract: Service-Oriented Computing (SOC) is the computing paradigm that utilizes services as fundamental elements for developing applications/solutions. To build the service model, SOC relies on the Service Oriented Architecture (SOA), which is a way of reorganizing software applications and infrastructure into a set of interacting services. However, the basic SOA does not address overarching concerns such as management, service orchestration, service transaction management and coordination, security, and other concerns that apply to all components in a services architecture. In this paper we introduce an Extended Service Oriented Architecture that provides separate tiers for composing and coordinating services and for managing services in an open marketplace by employing grid services and discuss how agent technology can be used to support the functions of the Extended SOA.