OpenID4VCI: W3C data model based formats and the use of "types" vs "type"

[Pedro Felix]

Just a minor detail about the use of the "types" field on the W3C VC based formats:

• The W3C data model uses type (singular) - https://www.w3.org/TR/vc-data-model/#types. This field is defined in the standard JSON-LD context present at https://www.w3.org/2018/credentials/v1
• However the OpenID4VCI spec is using types (plural), for jwt_vc_json, jwt_vc_json-ld, and ldp_vc (e.g. https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html#section-e.1.3.2).

Is this difference intentional? Note that when using JSON-LD processing, type will be well-defined (it is defined on https://www.w3.org/2018/credentials/v1 as an alias for @type) but types isn't.

[Kristina Yasuda]

PR #461

[Kristina Yasuda]

OID4VCI uses types in places that will not be handled using JSON-LD processing (as clarified in separate thread/PR), having said that, I think it will be easier to implement if the parameter names in credential offer, issuer metadata, etc. are consistent with what is in the issued JSON-LD credential.

[Kristina Yasuda]

PR merged.