Schema for a GeoJSON object

geojson.json

{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "id": "http://json-schema.org/geojson/geojson.json#",
    "title": "Geo JSON object",
    "description": "Schema for a Geo JSON object",
    "type": "object",
    "required": [ "type" ],
    "oneOf": [
        { "$ref": "http://json-schema.org/geojson/geometry.json#" },
        { "$ref": "#/definitions/geometryCollection" },
        { "$ref": "#/definitions/feature" },
        { "$ref": "#/definitions/featureCollection" }
    ],
    "definitions": {
        "geometryCollection": {
            "title": "GeometryCollection",
            "description": "A collection of geometry objects",
            "required": [ "geometries" ],
            "properties": {
                "type": { "enum": [ "GeometryCollection" ] },
                "geometries": {
                    "type": "array",
                    "items": { "$ref": "http://json-schema.org/geojson/geometry.json#" }
                }
            }
        },
        "feature": {
            "title": "Feature",
            "description": "A Geo JSON feature object",
            "required": [ "geometry", "properties" ],
            "properties": {
                "type": { "enum": [ "Feature" ] },
                "geometry": {
                    "oneOf": [
                        { "type": "null" },
                        { "$ref": "http://json-schema.org/geojson/geometry.json#" }
                    ]
                },
                "properties": { "type": [ "object", "null" ] },
                "id": { "FIXME": "may be there, type not known (string? number?)" }
            }
        },
        "featureCollection": {
            "title": "FeatureCollection",
            "description": "A Geo JSON feature collection",
            "required": [ "features" ],
            "properties": {
                "type": { "enum": [ "FeatureCollection" ] },
                "features": {
                    "type": "array",
                    "items": { "$ref": "#/definitions/feature" }
                }
            }
        }
    }
}