[Temporary] New text for chapter 16 Additional API Building Blocks

This standard uses the OpenAPI specification to define the JSON schemas and OpenAPI MAY also be used to describe the concrete API) see [sc_api_definition]). A variety of tools for automatic code generation exist for the OpenAPI specification. This makes it very easy for client and server implementers to work with APIs defined using OpenAPI. However, as the OGC API - Processes defines several JSON schemas and leaves the concrete data types for input and outputs open, the automatic code generation cannot be used to its full extent. To cope with this and thus make the implementation of clients / servers easier for those that are not familiar with OGC (API) standards, additional alternatives to the process description and the paths to processes and jobs are permitted.

The following permissions do not affect the mandatory core requirements.