National Tsing Hua University — jsonschema rules

# method: derived
# x-source-url: json-schema/ derived from openapi/_original/nthu-data-api.yaml
# note: Authored by API Evangelist, not published by National Tsing Hua University.
# authorship: generated by API Evangelist tooling. Stamped 2026-08-18
# on the file's own generator header (roadmap#64). An unmarked file is
# NOT assumed to be ours -- absence of evidence was never stamped.
x-method: generated
# nthu — JSON Schema Spectral ruleset (strengthened)
# Plain Spectral. Rules measured from this provider's own JSON Schema
# conventions by strengthen_jsonschema.py, then self-validated against them.
#
# Provenance:
#   - schema-declares-$schema: 8/8 roots
#   - schema-draft-consistency: 2020-12 @ 100%
#   - schema-has-title: 8/8 roots
#   - property-name-casing: snake @ 98% (n=51)
rules:
  schema-declares-$schema:
    description: Every JSON Schema document should declare its $schema (draft).
    severity: warn
    given: $
    then:
      field: $schema
      function: truthy
  schema-draft-consistency:
    description: $schema should reference the 2020-12 draft (this API's convention).
    severity: warn
    given: $.$schema
    then:
      function: pattern
      functionOptions:
        match: 2020\-12
  schema-has-title:
    description: JSON Schema documents should declare a title.
    severity: info
    given: $
    then:
      field: title
      function: truthy
  property-name-casing:
    description: Schema properties should be snake_case (the dominant convention in this API).
    severity: warn
    given: $..properties
    then:
      field: '@key'
      function: casing
      functionOptions:
        type: snake
  no-empty-descriptions:
    description: Descriptions must not be empty strings.
    severity: warn
    given: $..description
    then:
      function: truthy