//Example 18 - Examples of $expand query option

//Example request 1:
//http://example.org/v1.0/Things?$expand=Datastreams
//Returns the entity set of Things as well as each of the Datastreams associated with each Thing entity.

//Example request 1 response:

{
    "values": [
        {
            "@iot.id": 1,
            "@iot.selfLink": "http://example.org/v1.0/Things(1)",
            "Locations@iot.navigationLink": "Things(1)/Locations",
            "Datastreams@iot.count": 1,
            "Datastreams": [
                {
                    "@iot.id": 1,
                    "@iot.selfLink": "http://example.org/v1.0/Datastreams(1)",
                    "name": "oven temperature",
                    "description": "This is a datastream measuring the air temperature in an oven.",
                    "unitOfMeasurement": {
                        "name": "degree Celsius",
                        "symbol": "°C",
                        "definition": "http://unitsofmeasure.org/ucum.html#para-30"
                    },
                    "observationType": "http://www.opengis.net/def/observationType/OGC-OM/2.0/OM_Measurement",
                    "observedArea": {
                        "type": "Polygon",
                        "coordinates": [
                            [
                                [ 100, 0 ],
                                [ 101, 0 ],
                                [ 101, 1 ],
                                [ 100, 1 ],
                                [ 100, 0 ]
                            ]
                        ]
                    },
                    "phenomenonTime": "2014-03-01T13:00:00Z/2015-05-11T15:30:00Z",
                    "resultTime": "2014-03-01T13:00:00Z/2015-05-11T15:30:00Z"
                }
            ],
            "HistoricalLocations@iot.navigationLink": "Things(1)/HistoricalLocations",
            "description": "This thing is a convection oven.",
            "name": "Oven",
            "properties": {
                "owner": "John Doe",
                "color": "Silver"
            }
        }
    ]
}