DCAT-US3 JSON Schema doesn't comply with standard

[jbrown-xentity]

Name: James Brown

Affiliation: GSA/data.gov

Type of issue: Schema references

Issue: The schema references do not work as currently constructed, due to a variety of reasons. The ID fields keep the references from pointing to the right location. Also the schema is using an old JSON Schema standard.

• Testing required removing the IDs: https://github.com/GSA/dcat-us/blob/main/jsonschema/test_json_schema.py#L6-L20

Recommended change(s):

GSA and data.gov believe that the correct path forward (after reviewing best practices here is the following:

• Upgrade the JSON Schema to latest version (2020-12).
• Remove ID references in all sub-fields, and add ID field at the root object definition.
• Change "definitions" list to $defs per best practices
• Explore the best way to link the sub-schemas (ie dataset and organization) together.