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This document is a revision of the public working draft dated 1998-08-19 incorporating suggestions received in review comments and further deliberations of the W3C RDF Model and Syntax Working Group. With the publication of this draft, the RDF Model and Syntax Specification enters "last call." The last call period will end on October 23, 1998. Significant(More)
In this paper we present DAML-S, a DAML+OIL ontology for describing the properties and capabilities of Web Services. Web Services – Web-accessible programs and devices – are garnering a great deal of interest from industry, and standards are emerging for low-level descriptions of Web Services. DAML-S complements this effort by providing Web Service(More)
The Semantic Web should enable greater access not only to content but also to services on the Web. Users and software agents should be able to discover, invoke, compose, and monitor Web resources offering particular services and having particular properties. As part of the DARPA Agent Markup Language program, we have begun to develop an ontology of(More)
With the Resource Description Framework (RDF) and Web Ontology Language (OWL) - the languages that power the semantic Web - becoming standards and new technologies reaching maturity for embedding semantics in existing Web pages and querying RDF knowledge stores, something exciting is clearly happening in this area. Whereas the research community is widely(More)
The Resource Description Framework is a standard for Web metadata that the World Wide Web Consortium (W3C) developed. 1–3 Expanding the traditional notion of document metadata (such as library catalog information), RDF is suitable for describing any Web resource, and as such it provides interoperability between applications that exchange(More)
Wireless connectivity and widespread diffusion of portable devices offer novel opportunities for users to share resources anywhere and anytime, and to form ad-hoc coalitions. Resource access control is crucial to leverage these ad-hoc collaborations. In pervasive scenarios, however, collaborating entities cannot be predetermined and resource availability(More)
Context-awareness has been recognized as an important enabler for pervasive computing. Our aim is to provide a thorough survey of the state of the art in context representation and reasoning in the field of pervasive and context-aware computing. The review is organized in sections according to the knowledge representation techniques applied in the work(More)
Software application development is largely centered around various representations of data and representations of the world in which the software operates. Often, while a software system itself is specified in terms of procedures and procedural semantics, the data the system uses and manipulates has declarative semantics; connecting the two is often an ad(More)
Tuple spaces offer a coordination infrastructure for communication between autonomous entities by providing a logically shared memory along with data persistence, transactional security as well as temporal and spatial decoupling - properties that make it desirable in distributed systems for e-commerce and pervasive computing applications. In most tuple(More)