{
    "expr": "$sift(λ($v){$v.**.Postcode})",
    "dataset": "dataset1",
    "bindings": {},
    "result": {
        "Address": {
            "Street": "Hursley Park",
            "City": "Winchester",
            "Postcode": "SO21 2JN"
        },
        "Other": {
            "Over 18 ?": true,
            "Misc": null,
            "Alternative.Address": {
                "Street": "Brick Lane",
                "City": "London",
                "Postcode": "E1 6RF"
            }
        }
    }
}