$schema: https://json-schema.org/draft/2020-12/schema
description: 'A Shell feature: a closed surface boundary of a Solid, described as
  an ordered set of directed (oriented) Face references. geometry must be null.'
$defs:
  testCollection:
    $anchor: testCollection
    description: A convienence ref to a complete, testable collection objects and
      references
    $ref: https://ogcincubator.github.io/topo-feature/build/annotated/geo/topo/features/topo-feature-collection/schema.yaml
allOf:
- $ref: https://ogcincubator.github.io/topo-feature/build/annotated/geo/topo/features/topo-feature/schema.yaml
- properties:
    geometry:
      type: 'null'
    topology:
      properties:
        type:
          type: string
          const: Shell
        directed_references:
          type: array
          description: Ordered list of oriented Face references forming the closed
            shell surface
          items:
            $ref: https://ogcincubator.github.io/topo-feature/build/annotated/geo/topo/datatypes/oriented-ref/schema.yaml
          minItems: 4
          x-jsonld-id: https://purl.org/geojson/topo#directedReferences
          x-jsonld-container: '@list'
      required:
      - type
      - directed_references
      not:
        required:
        - references
      x-jsonld-type: '@id'
      x-jsonld-id: https://purl.org/geojson/vocab#topology
  required:
  - topology
x-jsonld-extra-terms:
  Shell: https://purl.org/geojson/topo#Shell
  ref: '@id'
  orientation: https://purl.org/geojson/topo#orientation
x-jsonld-prefixes:
  geojson: https://purl.org/geojson/vocab#
  topo: https://purl.org/geojson/topo#