Consider a "strict" schema to introduce JSON Schema validation keywords prior to 2.0

[jpmckinney]

Several issues deal with incorrect or missing JSON Schema validation keywords. See milestone: https://github.com/open-contracting/standard/milestone/25

Typically, we would need to wait for a major version (2.0) to make changes that invalidate data from earlier versions (i.e. backwards-incompatible changes).

However, we can offer a voluntary, "strict" schema that adds in these keywords, removes deprecated fields and codes, removes deprecated types, etc.

Users of the Data Review Tool could voluntarily select the strict schema. Similarly, OCDS Helpdesk analysts could inform publishers of opportunities to improve their data by passing the stricter criteria.

[duncandewhurst]

However, we can offer a voluntary, "strict" schema that adds in these keywords, removes deprecated fields and codes, removes deprecated types, etc.

It might be preferable to keep deprecated fields, codes, and types. If we remove them, then the DRT will report them as additional in which case it's less clear what to do about them than if they are flagged as deprecated in which case the deprecation notes usually explain what to do instead.

[jpmckinney]

Yes, we can keep the deprecated fields and codes.

The DRT (and schema) has nothing about deprecated types (e.g. "number" for ID fields), so it is better to remove them and cause a structural error.

[duncandewhurst]

Sounds good!

[duncandewhurst]

Are there any other types that we should remove, apart from "number" for ID fields and "null" for required fields?

[jpmckinney]

Not that I'm aware. I think most fields are single-type, but we can run some code to find any other multi-type.

[duncandewhurst]

I checked using a Python script and the only other multi-type fields are:

• Budget.projectID - I've updated the script in the PR to remove the integer type from this field
• Amendment.changes.former_value - this is part of a deprecated object and is in any case intentional so no need to change it