The state of the art in Linked Data

Joshua ShinavierThe state of the art in Linked DataAdvanced Semantic Web, Spring 2009Literature SurveyOutline• Linked Data• Linking Open Data• describing linked datasets• growing the data web• keeping Linked Data connected• indexing and searching• applications• navigation• state of the data web2Linked Data overview• resource -- an item of interest• URI -- global identifier for a resource• representation -- data corresponding to the state of a resource• information resource -- a “document” containing information• non-information resource -- anything else• associated description -- representation describing a Semantic Web resource3The Linking Open Data initiative• “bootstrap” the data web with large, interconnected data sets to reach a critical mass of semantics• strict adherence to W3C standards• identification and transportation (URI, HTTP) of resource descriptions• interpretation (RDF, RDFS, OWL) of resource descriptions• LOD grows as data providers:• publish structured data on the Web• set RDF links between entities in different data sources• transition of the web from a distributed document repository into a universal, ubiquitous database [Erling 09]4The LOD cloud5LOD data sets6Link sets in LOD7Describing linked datasets• voiD (Vocabulary of Interlinked Datasets) [Alexander, Cyganiak, Hausenblas, Zhao 09]• describes data sets the link sets between them• DING (Dataset RankING) [Toupikov, Umbrich, Delbru, Hausenblas, Tummarello 09]• ranking of linked datasets using formal descriptions• modeling of the Linked Data domain [Halpin, Presutti 09]8Keeping Linked Data connected• network-shaped Entity Name System to enable systematic reuse of URIs [Bouquet, Stoermer, Cordioli, Tummarello 08]• similar to DNS for interlinking hypertext• n2Mate framework [Peterson, Cregan, Atkinson, Brisbin 08]• use social networking principles to facilitate vocabulary and instance reuse• graph-based disambiguation of Semantic Web entities with idMesh [Cudré-Mauroux, Haghani, Jost, Aberer, de Meer 09]9Managing co-reference• many conflated resources in DBpedia [Jaffri, Glaser, Millard 08]• representative of LOD as a whole• Co-Reference Resolution Service [Glaser, Jaffri, Millard 09]• when co-reference is context-specific, owl:sameAs is inappropriate• stores co-reference information as a first-class entity• ontology-level alignment should precede data-level alignment [Nikolov, Uren, Motta 09]10