$schema: https://json-schema.org/draft/2020-12/schema
description: 'Topology datatype for topo-features. Supports two reference styles:
  ''references'' (array of string IDs) for simple positional references, and ''directed_references''
  (array of oriented object references with ref+orientation) for references where
  traversal direction matters. Exactly one of the two must be present.'
$defs:
  simpleRefs:
    description: Plain string ID references (e.g. LineString referencing point nodes)
    properties:
      type:
        not:
          enum:
          - Face
          - Ring
          - Shell
          - Solid
        x-jsonld-id: '@type'
      references:
        type: array
        items:
          $ref: https://opengeospatial.github.io/bblocks/annotated-schemas/ogc-utils/iri-or-curie/schema.yaml
        x-jsonld-id: https://purl.org/geojson/topo#relatedFeatures
        x-jsonld-type: '@id'
        x-jsonld-container: '@list'
    required:
    - references
    not:
      required:
      - directed_references
  nestedRefs:
    description: Plain string ID references (e.g. LineString referencing point nodes)
    properties:
      type:
        enum:
        - MultiLineString
        - Polygon
        - Polyhedron
        - Solid
        x-jsonld-id: '@type'
      references:
        type: array
        items:
          type: array
          items:
            oneOf:
            - $ref: https://opengeospatial.github.io/bblocks/annotated-schemas/ogc-utils/iri-or-curie/schema.yaml
            - description: wont check contents deeper
              type: array
        x-jsonld-id: https://purl.org/geojson/topo#relatedFeatures
        x-jsonld-type: '@id'
        x-jsonld-container: '@list'
    required:
    - references
    not:
      required:
      - directed_references
  directedRefs:
    description: "Oriented (directed) references \u2014 each with 'ref' and 'orientation'.
      Used for Ring, Shell."
    properties:
      type:
        enum:
        - Face
        - Ring
        - Shell
        - Solid
        x-jsonld-id: '@type'
      directed_references:
        type: array
        items:
          $ref: https://ogcincubator.github.io/topo-feature/build/annotated/geo/topo/datatypes/oriented-ref/schema.yaml
        x-jsonld-id: https://purl.org/geojson/topo#directedReferences
        x-jsonld-container: '@list'
    required:
    - directed_references
    not:
      required:
      - references
allOf:
- oneOf:
  - $ref: '#/$defs/simpleRefs'
  - $ref: '#/$defs/nestedRefs'
  - $ref: '#/$defs/directedRefs'
- properties:
    type:
      type: string
      x-jsonld-id: '@type'
    relationships:
      type: array
      items:
        allOf:
        - $ref: https://opengeospatial.github.io/bblocks/annotated-schemas/geo/json-fg/link-role/schema.yaml
        - properties:
            rel:
              const: topology
          required:
          - rel
      x-jsonld-id: https://purl.org/geojson/topo#relatedFeatures
      x-jsonld-type: '@id'
      x-jsonld-container: '@list'
  required:
  - type
x-jsonld-extra-terms:
  LineString: https://purl.org/geojson/vocab#LineString
  MultiLineString: https://purl.org/geojson/vocab#MultiLineString
  MultiPolygon: https://purl.org/geojson/vocab#MultiPolygon
  Polygon: https://purl.org/geojson/vocab#Polygon
  Arc: https://purl.org/geojson/vocab#Arc
  ArcWithCenter: https://purl.org/geojson/vocab#ArcWithCenter
  ArcByChord: https://purl.org/geojson/vocab#ArcByChord
  CircleByCenter: https://purl.org/geojson/vocab#CircleByCenter
  CubicSpline: https://purl.org/geojson/vocab#CubicSpline
  radius: https://purl.org/geojson/vocab#radius
  arcLength: https://purl.org/geojson/vocab#arcLength
  startTangentVector: https://purl.org/geojson/vocab#startTangentVector
  endTangentVector: https://purl.org/geojson/vocab#endTangentVector
  ref:
    x-jsonld-id: https://purl.org/geojson/topo#ref
  orientation: https://purl.org/geojson/topo#orientation
  Edge: https://purl.org/geojson/topo#Edge
  Face: https://purl.org/geojson/topo#Face
  Ring: https://purl.org/geojson/topo#Ring
  Shell: https://purl.org/geojson/topo#Shell
  Solid: https://purl.org/geojson/topo#Solid
  rings:
    x-jsonld-id: https://purl.org/geojson/topo#rings
    x-jsonld-container: '@list'
  shells:
    x-jsonld-id: https://purl.org/geojson/topo#shells
    x-jsonld-container: '@list'
  faces:
    x-jsonld-id: https://purl.org/geojson/topo#faces
    x-jsonld-container: '@list'
x-jsonld-prefixes:
  geojson: https://purl.org/geojson/vocab#
  topo: https://purl.org/geojson/topo#
  dct: http://purl.org/dc/terms/