Semantic Grid Resource Discovery using DHTs in Atlas.pdf

Semantic Grid Resource Discovery using DHTs in Atlas? Manolis Koubarakis, Zoi Kaoudi, Iris Miliaraki, Matoula Magiridou and Antonios Papadakis-Pesaresi Dept. of Informatic and Telecommunications National and Kapodistrian University of Athens Panepistimioupolis, Ilissia Athens 15784 Greece {manolis,zoi,iris,matoula,apapadak}@di.uoa.gr 1 Introduction For the Semantic Grid vision [13] to become a reality, high quality of service must be offered to users and applications at all levels of the Grid fabric. In this position paper, we concentrate on high quality of service in the provision of resource discovery services in Semantic Grids. Resource discovery is an important problem in Grids in general, and Semantic Grids in particular. We discuss how to achieve high-performance, scalability, resilience to failures, robustness and adaptivity in the provision of resource discovery services in Semantic Grids, and especially in OntoKit, the Semantic Grid toolkit currently under development in project OntoGrid [22]. OntoGrid () is a Semantic Grid project funded by the Grid Technologies unit of the European Commission under the strategic objective “Grid-based systems for Complex Problem Solving” of the Information Society Technologies programme of FP6. Our basic assumption in this paper is that Semantic Grid resources (e.g., ma- chines, services or ontologies) will be annotated by RDF(S) metadata. Metadata pervades the Semantic Grid and is used to describe Grid resources, the envi- ronment, provenance and trust information etc. [13]. The Resource Description Framework (RDF) and RDF Schema (RDFS) are frameworks for representing in- formation about Web resources. RDF(S) consists of W3C recommendations that enable the encoding, exchange and reuse of structured metadata, providing the means for publishing both human-readable and machine-processable informa- tion and vocabularies for semantically describing things on the Web. Although RDF(S) was originally proposed in the context of th