{
    "zone": {
        "_id": "<string> [ <class> ]",
        "_mapbody": {
            "type": {
                "_grammar": "forward"
            },
            "forward": {
                "_grammar": "( first | only )"
            },
            "forwarders": {
                "_grammar": "[ port <integer> ] [ tls <string> ] { ( <ipv4_address> | <ipv6_address> ) [ port <integer> ] [ tls <string> ]; ... }"
            },
            "template": {
                "_grammar": "<string>"
            }
        }
    }
}