Browsing by Author "McGuinness, Deborah L."
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Item owl:sameAs and Linked Data: An Empirical Study(2010-04-26) Ding, Li; Shinavier, Joshua; Finin, Tim; McGuinness, Deborah L.Linked Data is a steadily growing presence on the Web. In Linked Data, the description of resources can be obtained incrementally by dereferencing the URIs of resources via the HTTP protocol. The use of owl:sameAs further enriches the Linked Data space by declaratively supporting distributed semantic data integration at the instance level. When consuming Linked Data, users should be careful when handling owl:sameAs: in that URIs linked by owl:sameAs may not be appropriate for simple aggregation, and that recursively exploring owl:sameAs may lead to considerable network overhead. In this work, we discuss and conduct an empirical pilot study on the usage of owl:sameAs in the Linked Data community. The results include initial quantitative measures of the usage of owl:sameAs. Based on observations of these results, we further discuss several strategies for dealing with owl:sameAs in Linked Data applications.Item Tracking RDF Graph Provenance using RDF Molecules(2005-04-30) Ding, Li; Finin, Tim; Peng, Yun; da Silva, Paulo Pinheiro; McGuinness, Deborah L.The Semantic Web facilitates integrating partial knowledge and finding evidence for hypothesis from web knowledge sources. However, the appropriate level of granularity for tracking provenance of RDF graph remains in debate. RDF document is too coarse since it could contain irrelevant information. RDF triple will fail when two triples share the same blank node. Therefore, this paper investigates lossless decomposition of RDF graph and tracking the provenance of RDF graph using RDF molecule, which is the finest and lossless component of an RDF graph. A sub-graph is lossless if it can be used to restore the original graph without introducing new triples. A sub-graph is {\em finest} if it cannot be further decomposed into lossless sub-graphs. The lossless decomposition algorithms and RDF molecule have been formalized and implemented by a prototype RDF graph provenance service in Swoogle project.