TAILIEUCHUNG - Lecture Notes in Computer Science- P95

Lecture Notes in Computer Science- P95:This year, we received about 170 submissions to ICWL 2008. There were a total of 52 full papers, representing an acceptance rate of about 30%, plus one invited paper accepted for inclusion in this LNCS proceedings. The authors of these accepted papers | A Semantic Grid Application for E-Learning Data Sharing 459 The RDF structure is generic in the sense that it is based on the Directed Acyclic Graph DAG model. RDF is based on the idea of identifying things using Web identifiers called Uniform Resource Identifiers or URIs and describing resources in terms of simple statements about the properties of resources. Each statement is a triplet consisting of a subject a property and a property value or object . For example the triple http ex createdBy Wenya has the meaning of http has a creator and its value is Wenya . RDF also provides a way to define classes of resources and properties. These classes are used to build statements that assert facts about resources. While the grammar for XML documents is defined by DTD or XSchema RDF uses its own syntax RDF Schema or RDFS of writing a schema for resources. RDFS is expressive and it includes sub-class super-class relationships as well as constraints on the statements. The generic structure of RDF makes it easier for data interoperability and evolution because different types of data can be represented using the common graph model and it also offers greater value for data integration over disparate web sources of information. OWL is an extension of RDF RDFS and supports more sophisticated knowledge representation and inference. In our work RDF is used to describe E-learning data semantics and define the Elearning ontology in order to mediate heterogeneous databases. OGSA WSRF and the Globus Toolkit OGSA Web Service Resource Framework focuses on service-oriented architecture for grid application. In a grid computational resources storage resources networks programs databases and the like are all represented as services. A service-oriented view allows us to address the need for a standard interface definition mechanism local remote transparency adaptation to local OS services and uniform service semantics. The open source Globus Toolkit 20 is a .

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