Missing PATCH call in OpenAPI

[EricLo-417]

Hello OGC Connected System People,

I am currently making an implementation of api and it appears that OpenAPI is missing the PATCH request as defined in https://docs.ogc.org/is/23-001/23-001.html#_req_update

I also wanted to understand how PATCH would be expected to work with arrays.

For example,

Given object

{
  "some-field": {
     "some-value": "test"
  },
  "some-array": [
    {
       "some-other-value": "test"
    }
  ]
}

I am assuming the below request would work as expected (update a field and add a new one)

{
   "some-field": {
      "some-value": "updated-test",
      "new-value": "i am new field"
   }
}

But how does patching the array work.... is it just a full replace?

{
    "some-array": [
     {
         "some-new-object-value": "new-value"
     }
    ]
}

This may be listed in the linked feature's part 4. However, that link is currently broken http://www.opengis.net/doc/IS/ogcapi-features-4/1.0

[SpeckiJ]

As the OGC API Part 4 is not yet published (according to https://ogcapi.ogc.org/features/), one still has to use the link to the DRAFT https://docs.ogc.org/DRAFTS/20-002r1.html#_request_body_4 until the spec is finally finished.

https://docs.ogc.org/DRAFTS/20-002r1.html#update-overview

Modifying parts of a resource requires that a document describing the changes to be applied be provided by the client. This Standard does not mandate that a specific encoding for this document be supported by a server.

As far as I understood, the Spec does not even mandate any specific encoding of the Payload, therefore the behavior is currently fully implementation-defined. I think full replacement is the only sane option, using a "merging" strategy would require additional operations as you also need to be able to remove elements from the array.