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The new Semantic Web recommendations for RDF, RDFS and OWL have, at their heart, the RDF graph. Jena2, a second-generation RDF toolkit, is similarly centered on the RDF graph. RDFS and OWL reasoning are seen as graph-to-graph transforms, producing graphs of virtual triples. Rich APIs are provided. The Model API includes support for other aspects of the RDF(More)
Further information about D2RQ can be found at: http://www.wiwiss.fu-berlin.de/suhl/bizer/d2rq D2RQ can be downloaded from: http://sourceforge.net/projects/d2rq-map It will be crucial for many real-world Semantic Web applications to be able to access the content of non-RDF relational databases, used by most legacy systems, without having to replicate the(More)
RDF, semantic web, SPARQL This document describes SPARQL/Update (nicknamed "SPARUL"), an update language for RDF graphs. It uses a syntax derived form SPARQL. Update operations are performed on a collection of graphs in a Graph Store. Operations are provided to change existing RDF graphs as well as create and remove graphs with the Graph Store. Abstract(More)
semantic web, query, RDF, internet engineering RDF provides a basic way to represent data for the Semantic Web. We have been experimenting with the query paradigm for working with RDF data in semantic web applications. Query of RDF data provides a declarative access mechanism that is suitable for application usage and remote access. We describe work on a(More)
In this paper, we formalize the problem of Basic Graph Pattern (BGP) optimization for SPARQL queries and main memory graph implementations of RDF data. We define and analyze the characteristics of heuristics for selectivity-based static BGP optimization. The heuristics range from simple triple pattern variable counting to more sophisticated selectivity(More)
Part of fulfilling the vision of the Semantic Web is the exchange of RDF data between computer systems. The web enables the reuse of document resources so that people, and now systems, can obtain, combine and process information from other systems without explicit producer-consumer relationships. One precursor for the Semantic Web to achieve critical mass(More)
SWAN – a Semantic Web Application in Neuromedicine – is a project to develop an effective, integrated scientific knowledge infrastructure for the Alzheimer Disease (AD) research community, using the energy and self-organization of that community, enabled by Semantic Web technology. This infrastructure may later be deployed for research communities in other(More)
rdf, parallel processing This document describes the hardware and software architecture of a parallel processing framework for RDF data. The aim of the framework is to simplify the implementation of parallel programs and to support execution over cluster of off-the-shelf machines. From a scripting language, logical execution plans are constructed and then(More)
SIMILE is a joint project between MIT Libraries, MIT Computer Science and Artificial Intelligence Laboratory (CSAIL), HP Labs and the World Wide Web Consortium (W3C). It is investigating the application of Semantic Web tools, such as the Resource Description Framework (RDF), to the problem of dealing with heterogeneous metadata. This report describes how(More)