[DCQL] Specify what selecting a selectively disclosable object means

[ubamrein]

In Section 6.4 it is specified that DCQL allows [...] selecting a minimal dataset to fulfill the Verifier's request in a privacy-friendly manner [...]. Further Wallets MUST NOT send selectively disclosable claims that have not been selected according to the rules below.

The question now arose what happens with the following object

{
   "birth_place" : { <------ as a whole selectively disclosable
       "locality" : "somehting", <--- selectively disclosable
       "street" : "something street", <----- selectively disclosable
       "house_number" : 25 <---- _NOT_ selectively disclosable
   }
  [...]
}

when the following claims pointer is requested:

["birth_place"]

My interpretation of "selecting a minimal dataset to fulfill the verifiers request" would mean that only house_number would be revealed. I have asked this question to a very small non representative set of people, and intuitively all of them would agree with my interpretation.

The specification provides us with an example:

["address"]: The claim address with its sub-claims as the value is selected.

Which naively contradicts my interpretation...

I think it would make sense to clarify that "sub-claims" also includes selectively disclosable sub-claims (to clarify this is indeed the intention). If this was not the intention, then it should definitely be specified that it only includes "NON disclosable sub-claims".

[c2bo]

Agreed, it would probably be good to clarify this a bit better to avoid confusion.
My interpretation is that by requesting the object, you are requesting the fully revealed object - in that sense the "minimal dataset to fulfil the verifiers request" is the full disclosure.

We do expect verifiers to have some understanding of the schemas of credentials they are requesting - if they only need the house number, then they should request only the house number, whereas if they need the full object, they should request the full object (with the current syntax just requesting the object) imho.