{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schemas.opengis.net/json-fg/geometry-object.json",
  "title": "a JSON-FG geometry",
  "description": "This JSON Schema is part of JSON-FG version 1.0.0.",
  "oneOf": [
    {"$ref": "#/$defs/Point"             },
    {"$ref": "#/$defs/MultiPoint"        },
    {"$ref": "#/$defs/LineString"        },
    {"$ref": "#/$defs/MultiLineString"   },
    {"$ref": "#/$defs/Polygon"           },
    {"$ref": "#/$defs/MultiPolygon"      },
    {"$ref": "#/$defs/GeometryCollection"},
    {"$ref": "#/$defs/Polyhedron"        },
    {"$ref": "#/$defs/MultiPolyhedron"   },
    {"$ref": "#/$defs/Prism"             },
    {"$ref": "#/$defs/MultiPrism"        },
    {"$ref": "#/$defs/CircularString"    },
    {"$ref": "#/$defs/CompoundCurve"     },
    {"$ref": "#/$defs/CurvePolygon"      },
    {"$ref": "#/$defs/MultiCurve"        },
    {"$ref": "#/$defs/MultiSurface"      },
    {"$ref": "#/$defs/CustomGeometry"    }
  ],
  "$defs": {
    "CustomGeometry": {
      "title": "A custom geometry",
      "description": "A custom geometry object type that is not one of the standard GeoJSON geometry types or one of the JSON-FG extensions. It is defined as an object with a \"type\" member that is not one of the GeoJSON or JSON-FG types. This is a mechanism to keep the schema extensible so that validation will also validate JSON-FG root objects with new geometry types that are not (yet) standardized. Readers of JSON-FG root objects that encouter an unknown geometry type should ignore it and treat it as if the value would be 'null'.",
      "type": "object",
      "required": ["type"],
      "properties": {
        "type": {
          "type": "string",
          "not": {
            "enum": [
              "Feature",            "FeatureCollection",  "Point",
              "MultiPoint",         "LineString",         "MultiLineString",
              "Polygon",            "MultiPolygon",       "Polyhedron",
              "MultiPolyhedron",    "Prism",              "MultiPrism",
              "CircularString",     "CompoundCurve",      "CurvePolygon",
              "MultiCurve",         "MultiSurface",       "GeometryCollection"
            ]
          }
        }
      }
    },
    "CustomCurve": {
      "title": "A custom curve object",
      "description": "A custom curve object type that is not one of the standard GeoJSON curve types or one of the JSON-FG extensions. It is defined as an object with a \"type\" member that is not one of the GeoJSON or JSON-FG types. This is a mechanism to keep the schema extensible so that validation will also validate JSON-FG root objects with new geometry types that are not (yet) standardized. Readers of JSON-FG root objects that encouter an unknown curve type should ignore it and treat it as if the value would be 'null'.",
      "type": "object",
      "required": ["type"],
      "properties": {
        "type": {
          "type": "string",
          "not": { "enum": ["LineString", "CircularString", "CompoundCurve"] }
        }
      }
    },
    "CustomSurface": {
      "title": "A custom surface object",
      "description": "A custom surface object type that is not one of the standard GeoJSON surface types or one of the JSON-FG extensions. It is defined as an object with a \"type\" member that is not one of the GeoJSON or JSON-FG types. This is a mechanism to keep the schema extensible so that validation will also validate JSON-FG root objects with new geometry types that are not (yet) standardized. Readers of JSON-FG root objects that encouter an unknown surface type should ignore it and treat it as if the value would be 'null'.",
      "type": "object",
      "required": ["type"],
      "properties": {
        "type": {
          "type": "string",
          "not": { "enum": ["Polygon", "CurvePolygon"] }
        }
      }
    },
    "Point": {
      "title": "GeoJSON Point with additional 'coordRefSys' and 'measures' members",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type"       : {"const": "Point"                            },
        "coordRefSys": {                  "$ref": "coordrefsys.json"},
        "measures"   : {                  "$ref": "measures.json"   },
        "coordinates": {                  "$ref": "#/$defs/position"},
        "bbox"       : {                  "$ref": "#/$defs/bbox"    }
      }
    },
    "LineString": {
      "title": "GeoJSON LineString with additional 'coordRefSys' and 'measures' members",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {"const": "LineString"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "coordinates": {
          "type": "array",
          "minItems": 2,
          "items": {"$ref": "#/$defs/position"}
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "Polygon": {
      "title": "GeoJSON Polygon with additional 'coordRefSys' and 'measures' members",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {"const": "Polygon"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "coordinates": {
          "type": "array",
          "items": {
            "type": "array",
            "minItems": 4,
            "items": {"$ref": "#/$defs/position"}
          }
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "MultiPoint": {
      "title": "GeoJSON MultiPoint with additional 'coordRefSys' and 'measures' members",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {"const": "MultiPoint"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "coordinates": {
          "type": "array",
          "items": {"$ref": "#/$defs/position"}
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "MultiLineString": {
      "title": "GeoJSON MultiLineString with additional 'coordRefSys' and 'measures' members",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {"const": "MultiLineString"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "coordinates": {
          "type": "array",
          "items": {
            "type": "array",
            "minItems": 2,
            "items": {"$ref": "#/$defs/position"}
          }
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "MultiPolygon": {
      "title": "GeoJSON MultiPolygon with additional 'coordRefSys' and 'measures' members",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {"const": "MultiPolygon"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "coordinates": {
          "type": "array",
          "items": {
            "type": "array",
            "items": {
              "type": "array",
              "minItems": 4,
              "items": {"$ref": "#/$defs/position"}
            }
          }
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "GeometryCollection": {
      "title": "GeoJSON GeometryCollection with additional 'coordRefSys' and 'measures' members",
      "type": "object",
      "required": ["type", "geometries"],
      "properties": {
        "type": {"const": "GeometryCollection"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "geometries": {
          "type": "array",
          "items": {
            "allOf": [
              {
                "oneOf": [
                  {"$ref": "#/$defs/Point"          },
                  {"$ref": "#/$defs/MultiPoint"     },
                  {"$ref": "#/$defs/LineString"     },
                  {"$ref": "#/$defs/MultiLineString"},
                  {"$ref": "#/$defs/Polygon"        },
                  {"$ref": "#/$defs/MultiPolygon"   }
                ]
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"coordRefSys": {}},
                  "required": ["coordRefSys"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"measures": {}},
                  "required": ["measures"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"conformsTo": {}},
                  "required": ["conformsTo"]
                }
              }
            ]
          }
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "Polyhedron": {
      "title": "JSON-FG Polyhedron",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {"const": "Polyhedron"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "coordinates": {
          "type": "array",
          "minItems": 1,
          "items": {
            "type": "array",
            "minItems": 1,
            "items": {
              "type": "array",
              "minItems": 1,
              "items": {
                "type": "array",
                "minItems": 4,
                "items": {"$ref": "#/$defs/position3d"}
              }
            }
          }
        },
        "bbox": {"$ref": "#/$defs/bbox3d"}
      }
    },
    "MultiPolyhedron": {
      "title": "JSON-FG MultiPolyhedron",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {"const": "MultiPolyhedron"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "coordinates": {
          "type": "array",
          "items": {
            "type": "array",
            "minItems": 1,
            "items": {
              "type": "array",
              "minItems": 1,
              "items": {
                "type": "array",
                "minItems": 1,
                "items": {
                  "type": "array",
                  "minItems": 4,
                  "items": {"$ref": "#/$defs/position3d"}
                }
              }
            }
          }
        },
        "bbox": {"$ref": "#/$defs/bbox3d"}
      }
    },
    "Prism": {
      "title": "JSON-FG Prism",
      "type": "object",
      "required": ["type", "base", "upper"],
      "properties": {
        "type": {"const": "Prism"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "base": {
          "allOf": [
            {
              "oneOf": [
                {"$ref": "#/$defs/Point"          },
                {"$ref": "#/$defs/MultiPoint"     },
                {"$ref": "#/$defs/LineString"     },
                {"$ref": "#/$defs/MultiLineString"},
                {"$ref": "#/$defs/Polygon"        },
                {"$ref": "#/$defs/MultiPolygon"   }
              ]
            },
            {
              "not": {
                "type": "object",
                "properties": {"coordRefSys": {}},
                "required": ["coordRefSys"]
              }
            },
            {
              "not": {
                "type": "object",
                "properties": {"measures": {}},
                "required": ["measures"]
              }
            },
            {
              "not": {
                "type": "object",
                "properties": {"conformsTo": {}},
                "required": ["conformsTo"]
              }
            }
          ]
        },
        "lower": {"type": "number"},
        "upper": {"type": "number"},
        "bbox": {"$ref": "#/$defs/bbox3d"}
      }
    },
    "MultiPrism": {
      "title": "JSON-FG Multi-Prism",
      "type": "object",
      "required": ["type", "prisms"],
      "properties": {
        "type": {"const": "MultiPrism"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "prisms": {
          "type": "array",
          "items": {
            "allOf": [
              {"$ref": "#/$defs/Prism"},
              {
                "not": {
                  "type": "object",
                  "properties": {"coordRefSys": {}},
                  "required": ["coordRefSys"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"measures": {}},
                  "required": ["measures"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"conformsTo": {}},
                  "required": ["conformsTo"]
                }
              }
            ]
          }
        },
        "bbox": {"$ref": "#/$defs/bbox3d"}
      }
    },
    "CircularString": {
      "title": "JSON-FG CircularString",
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": {"const": "CircularString"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "coordinates": {
          "type": "array",
          "oneOf": [
            {"minItems":  3, "maxItems":  3},
            {"minItems":  5, "maxItems":  5},
            {"minItems":  7, "maxItems":  7},
            {"minItems":  9, "maxItems":  9},
            {"minItems": 11, "maxItems": 11}
          ],
          "items": {"$ref": "#/$defs/position"}
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "CompoundCurve": {
      "title": "JSON-FG CompoundCurve",
      "type": "object",
      "required": ["type", "geometries"],
      "properties": {
        "type": {"const": "CompoundCurve"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "geometries": {
          "type": "array",
          "minItems": 1,
          "items": {
            "allOf": [
              {
                "oneOf": [
                  {"$ref": "#/$defs/LineString"    },
                  {"$ref": "#/$defs/CircularString"},
                  {"$ref": "#/$defs/CustomCurve"   }
                ]
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"coordRefSys": {}},
                  "required": ["coordRefSys"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"measures": {}},
                  "required": ["measures"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"conformsTo": {}},
                  "required": ["conformsTo"]
                }
              }
            ]
          }
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "CurvePolygon": {
      "title": "JSON-FG CurvePolygon",
      "type": "object",
      "required": ["type", "geometries"],
      "properties": {
        "type": {"const": "CurvePolygon"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "geometries": {
          "type": "array",
          "minItems": 1,
          "items": {
            "allOf": [
              {
                "oneOf": [
                  {"$ref": "#/$defs/CompoundCurve" },
                  {"$ref": "#/$defs/LineString"    },
                  {"$ref": "#/$defs/CircularString"},
                  {"$ref": "#/$defs/CustomCurve"   }
                ]
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"coordRefSys": {}},
                  "required": ["coordRefSys"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"measures": {}},
                  "required": ["measures"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"conformsTo": {}},
                  "required": ["conformsTo"]
                }
              }
            ]
          }
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "MultiCurve": {
      "title": "JSON-FG MultiCurve",
      "type": "object",
      "required": ["type", "geometries"],
      "properties": {
        "type": {"const": "MultiCurve"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "geometries": {
          "type": "array",
          "minItems": 1,
          "items": {
            "allOf": [
              {
                "oneOf": [
                  {"$ref": "#/$defs/CompoundCurve" },
                  {"$ref": "#/$defs/LineString"    },
                  {"$ref": "#/$defs/CircularString"},
                  {"$ref": "#/$defs/CustomCurve"   }
                ]
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"coordRefSys": {}},
                  "required": ["coordRefSys"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"measures": {}},
                  "required": ["measures"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"conformsTo": {}},
                  "required": ["conformsTo"]
                }
              }
            ]
          }
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "MultiSurface": {
      "title": "JSON-FG MultiSurface",
      "type": "object",
      "required": ["type", "geometries"],
      "properties": {
        "type": {"const": "MultiSurface"},
        "coordRefSys": {"$ref": "coordrefsys.json"},
        "measures": {"$ref": "measures.json"},
        "geometries": {
          "type": "array",
          "minItems": 1,
          "items": {
            "allOf": [
              {
                "oneOf": [
                  {"$ref": "#/$defs/CurvePolygon" },
                  {"$ref": "#/$defs/Polygon"      },
                  {"$ref": "#/$defs/CustomSurface"}
                ]
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"coordRefSys": {}},
                  "required": ["coordRefSys"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"measures": {}},
                  "required": ["measures"]
                }
              },
              {
                "not": {
                  "type": "object",
                  "properties": {"conformsTo": {}},
                  "required": ["conformsTo"]
                }
              }
            ]
          }
        },
        "bbox": {"$ref": "#/$defs/bbox"}
      }
    },
    "position": {
      "type": "array",
      "minItems": 2,
      "maxItems": 4,
      "items": {"type": "number"}
    },
    "position3d": {
      "type": "array",
      "minItems": 3,
      "maxItems": 4,
      "items": {"type": "number"}
    },
    "bbox": {
      "oneOf": [ {"$ref": "#/$defs/bbox2d"}, {"$ref": "#/$defs/bbox3d"} ]
    },
    "bbox2d": {
      "type": "array",
      "minItems": 4,
      "maxItems": 4,
      "items": {"type": "number"}
    },
    "bbox3d": {
      "type": "array",
      "minItems": 6,
      "maxItems": 6,
      "items": {"type": "number"}
    }
  }
}