Unique identifier for the JSON-LD Syntax.

'http://www.w3.org/ns/formats/JSON-LD' is the URI. JSON-LD is defined by the “JSON-LD Syntax 1.0: A Context-based JSON Serialization for Linking Data” W3C Recommendation. It has a media type: ‘application/ld+json’ and a preferred suffix: ‘.jsonld’. (See the for further details on the Media Registration.)