github.com/kaptinlin/jsonschema@v0.4.6/testdata/JSON-Schema-Test-Suite/tests/draft7/optional/format (about) date-time.json date.json email.json hostname.json idn-email.json idn-hostname.json ipv4.json ipv6.json iri-reference.json iri.json json-pointer.json regex.json relative-json-pointer.json time.json unknown.json uri-reference.json uri-template.json uri.json