{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "crs.json#",
  "title": "crs",
  "description": "A Coordinate Reference System object.",
  "type": ["object", "null"],
  "required": ["type", "properties"],
  "properties": {
    "type": {
      "type": "string",
      "description": "The type of coordinate reference system."
    },
    "properties": {
      "type": "object",
      "description": "Coordinate reference system properties."
    }
  },
  "additionalProperties": false,
  "oneOf": [
    {
      "$ref": "#/definitions/namedCrs"
    }, {
      "$ref": "#/definitions/linkedCrs"
    }
  ],
  "definitions": {
    "namedCrs": {
      "title": "namedCrs",
      "description": "A GeoJSON CRS object that indicates a coordinate reference system by name.",
      "properties": {
        "type": {
          "enum": ["name"],
          "description": "A CRS object may indicate a coordinate reference system by name. In this case, the value of its \"type\" member must be the string \"name\"."
        },
        "properties": {
          "description": "Coordinate reference system properties.",
          "required": ["name"],
          "additionalProperties": false,
          "properties": {
            "name": {
              "type": "string",
              "description": "The name of the coordinate reference system.",
              "translation": {
                "ISO 19115-2": ["geographicElement > EX_BoundingPolygon > polygon > [Point, LineString, Polygon, MultiGeometry] @srsName"]
              },
              "FIXME": "semantic validation necessary"
            }
          }
        }
      }
    },
    "linkedObject": {
      "type": "object",
      "title": "linkedObject",
      "description": "An object that links to a coordinate reference system definition.",
      "required": ["href"],
      "properties": {
        "href": {
          "$ref": "../../schema.json#/definitions/url",
          "description": "A dereferenceable URI that links to the parameters for the coordinate reference system."
        },
        "type": {
          "type": "string",
          "description": "A string that hints at the format used to represent CRS parameters at the provided URI. Suggested values are: \"proj4\", \"ogcwkt\", \"esriwkt\", but others can be used."
        }
      }
    },
    "linkedCrs": {
      "title": "linkedCrs",
      "description": "A GeoJSON CRS object that links to coordinate reference system parameters on the Web.",
      "properties": {
        "type": {
          "enum": ["link"],
          "description": "A CRS object may link to CRS parameters on the Web. In this case, the value of its \"type\" member must be the string \"link\"."
        },
        "properties": {
          "$ref": "#/definitions/linkedObject"
        }
      }
    }
  }
}