Sudhir Agarwal

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In this paper we make a contribution to the proof and trust layer of the Semantic Web layer cake by integrating two well founded techniques, namely DAML-S (for describing Web services with machine-processable semantics) and SPKI/SDSI (for specifying authorization based access control). Our approach builds on the idea of autonomous granting of access rights(More)
The way that web services are currently being developed places them beside rather than within the existing World Wide Web. In this paper we present an approach that combines the strength of the World Wide Web, viz. interlinked HTML pages for presentation and human consumption, with the strength of semantic web services, viz. support for semi-automatic(More)
Semantically rich descriptions of web services enable automatic composition and matchmaking. End users as well as providers compose web services according to their needs. Since in general, there can be more than one possibilities (combinations of web services) to achieve a certain goal, a user has to decide which of the alternatives suits him the best. This(More)
Web services help in achieving increased automation across organizational boundaries. In this paper, we present an approach for annotating WSDL documents with semantically rich descriptions. We also present an algorithm that considers such annotations in addition to just the types of input and output parameters. Our matchmaking algorithm not only returns(More)
In this paper, we present an approach to enable access control for semantic Web services. Our approach builds on the idea of autonomous granting of access rights, decision making based on independent trust structures and respects privacy requirements of the users. Our framework allows the specification and computation of complex access control policies in a(More)
The way that web services are currently being developed places them beside rather than within the existing World Wide Web. In this paper we present an approach that combines the strength of the World Wide Web, viz. interlinked HTML pages for presentation and human consumption, with the strength of semantic web services, viz. support for semi-automatic(More)
In order to find suitableWeb services from a large collection of Web services, automatic support is needed to filter out Web services relevant according to some criteria specified by the user. In real business scenarios constraints on the types of input and output parameters are often not sufficient. Rather one wishes to specify constraints on relationships(More)
The paper describes a set of approaches for representing and accessing information within a semantically structured information portal, while offering the possibility to integrate own information. It discusses research performed within the project ‘Semantic Methods and Tools for Information Portals (SemIPort)’. In particular, it focuses on (1) the(More)