Research Problems in Semantic Web Search.ppt

Research Problems in Semantic Web Search Varish Mulwad ____________________________ * Agenda Introduction Swoogle Swoogle’s Competition – Sindice Semantic Web Search Engine (SWSE) Watson Falcon Research Problems and Issues with Swoogle References ____________________________ * Introduction ____________________________ * Web Dr.Finin’s FOAF Profile Your Agent Possible because: Data is in machine understandable form like – RDF, OWL But how will agent find all this data ? Search Engines ? Introduction * ____________________________ Traditional Search Engine Results Semantic Web Search Engine Results Swoogle Swoogle is a crawler based indexing and retrieval system for Semantic Web Swoogle crawls and discovers documents written in RDF,OWL Swoogle classifies a Semantic Web Document(SWD) as – Semantic Web Ontology (SWO) – Defines new terms Semantic Web Databases (SWDB) – Makes assertions about individuals ____________________________ * Swoogle SWOOGLE DEMO ____________________________ * Swoogle Architecture ____________________________ * Swoogle Architecture SWD Discovery Component Google crawler using the Google web service Filetypes with extensions “.rdf”, ”.owl”, “.n3” Google limits only 1000 results per query A focussed crawler Crawls documents within a given website Extension and Focus constraints A Swoogle crawler Jena based crawler Explores Semantic Links between SWDs ____________________________ * Swoogle Architecture Metadata Creation Basic Metadata Encoding – “RDF/XML”, “N-Triple”, “N3” Language – RDF, RDFS, OWL, DAML + OIL OWL Species – OWL-LITE, OWL-DL, OWL-FULL Relations among SWDs Reference relationship among SWDs Inter ontology relationships ____________________________ * Swoogle Architecture Data analysis component Classification of SWD as SWO or SWDB Compute rank of SWD Web based interface Human User Interface – Web Services using REST interface Agent Service ____________________________ * Sindice Created at