{
    "expr": "**[*].$sift(λ($v){$v.Postcode})",
    "dataset": "dataset1",
    "bindings": {},
    "result": [
        {
            "Address": {
                "Street": "Hursley Park",
                "City": "Winchester",
                "Postcode": "SO21 2JN"
            }
        },
        {
            "Alternative.Address": {
                "Street": "Brick Lane",
                "City": "London",
                "Postcode": "E1 6RF"
            }
        }
    ]
}