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Wikidata data model

Information Model Knowledge Graph openly published

Wikidata represents entities as data items (e.g. Tim Berners-Lee (Q80) and CERN (Q42944) are data items). Knowledge about data items is represented via statements , whose basic structure consists of a subject , a predicate and an object ....

What I make of it

Items, properties, statements, qualifiers, references — the most widely reused open knowledge model.