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Triplestore
A triplestore or RDF store is a purpose-built database for the storage and retrieval of triples〔(TripleStore ), Jack Rusher, Semantic Web Advanced Development for Europe (SWAD-Europe), Workshop on Semantic Web Storage and Retrieval - Position Papers〕 through semantic queries. A triple is a data entity composed of subject-predicate-object, like "Bob is 35" or "Bob knows Fred".
Much like a relational database, one stores information in a triplestore and retrieves it via a query language. Unlike a relational database, a triplestore is optimized for the storage and retrieval of triples. In addition to queries, triples can usually be imported/exported using Resource Description Framework (RDF) and other formats.
== Implementations ==
(詳細はdocument-oriented database engines.〔Storage and Management of Semi-structured Data (Use of SQL relational databases as an RDF triple store), 2003〕 Like the early development of online analytical processing (OLAP) databases, this intermediate approach allowed large and powerful database engines to be constructed for little programming effort in the initial phases of triplestore development. Long-term though it seems likely that native triplestores will have the advantage for performance. A difficulty with implementing triplestores over SQL is that although ''triples'' may thus be ''stored'', implementing efficient querying of a graph-based RDF model (e.g., mapping from SPARQL) onto SQL queries is difficult.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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