Eliminating the NGSILD-Warning header from the BadRequest and NotFound responses within the 5.8.3 Retrieve Subscription operation.

Including options.sysAttrs paramenter within the  5.8.3 Retrieve Subscription operation. As stated in 6.3.11 Including system generated attributes: For HTTP GET operations performed over the resources /entities/, /subscriptions/, /csourceRegistrations/, /csourceSubscriptions/ and all of its sub-resources, implementations shall support the parameter options.sysAttrs.

Adding a folder for defining examples of custom OpenAPI schemas that are compliant with the NGSI-LD OAS.

Eliminate the required option within the Subcription.Periodic schema for fields entities and timeInterval. Move the required option for the entities fields to the schemas statement of the Subscription request body.

Fixing an indentation issue with the additionalProperties field in the Schemas of Entity and Relationship within the NGSI-LD OAS.

Update links within the README file and add a link to view the original NGSI-LD OAS in the Swagger Editor of ETSI Forge.

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).