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With development of Semantic Web, much research focuses on various technologies about Web ontology. Especially, for management and searching of data in Web ontology, various storages based on RDB and Query Languages (e.g., SPARQL, RDQL and RQL) have been developed with activity. SPARQL cannot search data in RDB model because RDB model use SQL as query language. The Resource Description Format (RDF) is used to represent information modeled as a "Graph": a set of individual objects, along with a set of connections among those objects.
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