Generally speaking, the data model used for JSON-LD is a labeled, directed graph. The graph contains nodes, which are connected by edges. A node is typically data such as a string, number, typed values (like dates and times) or an IRI. There is also a special class of node called a blank node, which is typically used to express data that does not have a global identifier like an IRI. Blank nodes are identified using a blank node identifier. (W3C TR http://www.w3.org/TR/json-ld: JSON-LD 1.0)


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