{
    "_remove": {
        "b": 2
    }, 
    "_update": {
        "a": 2, 
        "children": {
            "_update": {
                "son": "Ivánek"
            }, 
            "_append": {
                "daughter": "Maruška"
            }
        }
    }, 
    "_append": {
        "c": 3
    }
}