{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "POI location",
    "type": "object",
    "properties": {
        "wgs84": {
            "title": "World Geodetic System",
            "description": "",
            "type": "object",
            "properties": {
                "latitude": {
                    "description": "degrees north",
                    "type": "number"
                },
                "longitude": {
                    "description": "degrees east",
                    "type": "number"
                },
                "height": {
                    "description": "meters up from sea level, optional",
                    "type": "number"
                }
            },
            "additionalProperties": false
        }
    },
    "additionalProperties": false
}