Geometry.json

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "id": "http://raw.githubusercontent.com/peterataylor/om-json/master/Geometry.json",
    "title": "geometry",
    "description": "One geometry object, as defined in GeoJSON",
    "definitions": {
        "position": {
            "description": "A single position",
            "type": "array",
            "minItems": 2,
            "items": { "type": "number" },
            "additionalItems": false
        },
        "positionArray": {
            "description": "An array of positions",
            "type": "array",
            "items": { "$ref": "#/definitions/position" }
        },
        "lineString": {
            "description": "An array of two or more positions",
            "allOf": [
                { "$ref": "#/definitions/positionArray" },
                { "minItems": 2 }
            ]
        },
        "linearRing": {
            "description": "An array of four or more positions where the first equals the last",
            "allOf": [
                { "$ref": "#/definitions/positionArray" },
                { "minItems": 4 }
            ]
        },
        "polygon": {
            "description": "An array of linear rings",
            "type": "array",
            "items": { "$ref": "#/definitions/linearRing" }
        },
        "geometryObject": {
          "oneOf": [
              {
                  "title": "Point",
                  "type": "object",
                  "properties": {
                      "type": { "enum": [ "Point" ] },
                      "coordinates": { "$ref": "#/definitions/position" }
                  },
                  "required": [ "type", "coordinates" ]
              },
              {
                  "title": "MultiPoint",
                  "type": "object",
                  "properties": {
                      "type": { "enum": [ "MultiPoint" ] },
                      "coordinates": { "$ref": "#/definitions/positionArray" }
                  },
                  "required": [ "type", "coordinates" ]
              },
              {
                  "title": "LineString",
                  "type": "object",
                  "properties": {
                      "type": { "enum": [ "LineString" ] },
                      "coordinates": { "$ref": "#/definitions/lineString" }
                  },
                  "required": [ "type", "coordinates" ]
              },
              {
                  "title": "MultiLineString",
                  "type": "object",
                  "properties": {
                      "type": { "enum": [ "MultiLineString" ] },
                      "coordinates": {
                          "type": "array",
                          "items": { "$ref": "#/definitions/lineString" }
                      }
                  },
                  "required": [ "type", "coordinates" ]
              },
              {
                  "title": "Polygon",
                  "type": "object",
                  "properties": {
                      "type": { "enum": [ "Polygon" ] },
                      "coordinates": { "$ref": "#/definitions/polygon" }
                  },
                  "required": [ "type", "coordinates" ]
              },
              {
                  "title": "MultiPolygon",
                  "type": "object",
                  "properties": {
                      "type": { "enum": [ "MultiPolygon" ] },
                      "coordinates": {
                          "type": "array",
                          "items": { "$ref": "#/definitions/polygon" }
                      }
                  },
                  "required": [ "type", "coordinates" ]
              },
              {
                  "title": "GeometryCollection",
                  "type": "object",
                  "properties": {
                      "type": { "enum": [ "GeometryCollection" ] },
                      "geometries": {
                          "type": "array",
                          "items": { "$ref": "#/definitions/geometryObject" }
                      }
                  },
                  "required": [ "type", "geometries" ]
              }
          ]
        }
    },
    "properties": {
        "geometry": { "$ref": "#/definitions/geometryObject"}        
    },
    "required": [ "geometry" ]
}