The present document defines the NGSI-LD API Specification. This Context Information Management API allows users to provide, consume and subscribe to context information in multiple scenarios and involving multiple stakeholders. Context information is modelled as attributes of context entities, also referred to as "digital twins", representing real-world assets (e.g. a bus in a city or a luggage claim ticket). Because of that, the NGSI-LD API is often used to bring standardized access to digital twin data.
The ongoing status of the NGSI-LD API can be found in [i.17].
The ETSI ISG CIM has decided to give the name "NGSI-LD" to the Context Information Management API. The rationale is to reinforce the fact that the present document leverages on the former OMA NGSI 9 and 10 interfaces [i.3] and FIWARE® NGSIv2 [i.9] to incorporate the latest advances from Linked Data.
Most of the NGSI-LD API and the ETSI ISG CIM information model work referenced here was created with the support of the following European Union Horizon 2020 research projects: No. 732851 (FI-NEXT), No. 723156 (WISE-IoT), No. 732240 (SynchroniCity) and No. 731993 (AutoPilot), No. 814918 (Fed4IoT), No. 779852 (IoTCrawler), No. 731884 (IoF2020), including many contributions from members of the FIWARE® Community.