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=== Subject-predicate-object databases === Subject-predicate-object databases basically construct [[w:semantic]] networks from interlinked atomic units called a [[w:triplet]] so they are not fundamentally different from graph databases in functionality and utility offered. These networks may be queried with a suitable query language such as [[w:SPARQL]] which in practice allows you to compose semantic queries. {{Q|'''SPARQL''' is a [[w:recursive acronym|recursive acronym]] and stands for '''SPARQL Protocol and RDF Query Language'''). It is an [[w:RDF query language|RDF query language]], that is, a [[w:Semantic_Query|semantic]] [[w:query language|query language]] for [[w:database|database]]s, able to retrieve and manipulate data stored in [[w:Resource Description Framework|Resource Description Framework (RDF)]] format.|Wikipedia|[[w:SPARQL|SPARQL]]}} {{Q|A '''triplestore''' or '''RDF store''' is a purpose-built [[w:database|database]] for the storage and retrieval of [[w:Resource Description Framework#Overview|triples]] through [[w:Semantic Query|semantic queries]].|Wikipedia|[[w:Triplestore]]}} ==== Relevant subject-predicate-object database powered systems to interoperate with ==== * '''[[Semantic MediaWiki]]''' is system for inputting and querying semantic data within the MediaWiki and it is implemented as extension(s). * '''[[DBpedia]]''' the original structured data harvesting effort for the MediaWiki wikis * '''[[Wikidata]]''' is effort by the [[Wikimedia Foundation]] since 2012 to provide a central storage for data items instead of manually replicating it in various language versions ==== Things to consider in selection of triplestore ==== {{Q|Some '''subject-predicate-object databases''' (also known as ''[[w:triplestore|triplestore]]s'') have been built as database engines from scratch, while others have been built on top of existing commercial relational database engines (e.g., SQL-based).|Wikipedia|[[w:list of subject-predicate-object databases|list of subject-predicate-object databases]]}} ==== Lists and comparisons of subject-predicate-object databases and SPARQL implementations ==== * [[w:List of subject-predicate-object databases|Wikipedia's list of subject-predicate-object databases]] * [[w:List of SPARQL implementations|Wikipedia's list of SPARQL implementations]] ----
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