Support for publishing programmable application schemas of feature objects and codelists provided by OGC API Features service

[teezip]

According to OGC API Features discussion Support for OpenAPI 3.1 proper support for application schemas has waited OpenAPI version 3.1.

OpenAPI 3.1 has been released in 2021-02-16.

Related to OGC API Features there is proposal for an extension called OGC API - Features - Part n: Schemas. And there is a project page in GitHub for it. However no information about schedule for first draft?

Maybe there's two approaches to publish schemas in distant future:

• schema information included in a OpenAPI 3.1 document published in /api resource (based on separate conformance class to Open API 3.0 document, that is indicated by the conformance class http://www.opengis.net/spec/ogcapi-features-1/1.0/conf/oas30)?
• schema information published according to future "OGC API - Features - Part n: Schemas" specification in some kind of returnables resources?
  • returnables (default): The schema will specify an object as it is returned at the /collections/{collectionId}/items/{featureId} endpoints of the collection.

[teezip]

Currently Hakunapi support (unofficially as standards are still draft) accessing schemas for collection - for example:
https://beta-paikkatieto.maanmittauslaitos.fi/inspire-addresses/features/v1/collections/addresses/schema

Open API version by NLS of Finland: currently the officially supported version is still 3.0 (supported by all toolchains), maybe in future version 3.1 too.

So maybe OGC API - Features - Part 5: Schemas extension shall be supported first in Hakunapi after that standard part is finalized by OGC standardization process. Support for OpenAPI 3.1 should be followed too.