Adding the Query.options.sysAttrs parameter for the 5.10.1 Retrieve Context Source Registration operation.

Show the @context field on top of the request and response bodies for the Registry API operations for Context Source Registration and Context Source Discovery.

Adding the required endpoint field within the CsourcRegistration data type for the  5.9.2 Register Context Source operation. Updating description for CsourceRegistration data type.

Create an initial fork repository to work on the OpenAPI Specification (OAS) for the NGSI-LD API specified by the cross-cutting Context Information Management (CIM) ETSI Industry Specification Group (ISG).