I've parsed some JSON data using NSJSONSerialization from the Foundation framework - however, I'm getting a weird key for an NSDictionary group as follows

```
"stop_times" =     (
            {
        "departure_time" = "5:48a";
        "departure_timestamp" = 1355309284;
        "service_id" = 1;
        shape = "Scarborough RT To Kennedy Station";
            }

```

Any idea what the key "shape" might be? Is it a string? I didn't think so since it wasn't surrounded with double quotation marks. Thanks for your help in advance!