{
    "type": "array",
    "doc" : "store all the nodes by index",
    "items" : {
        "type" : "record",
        "name" : "Node",
        "doc": "Store a node in the hierarchy.",
        "fields" : [
            {
                "name" : "name",
                "type" : "string"
            },
            {
                "name" : "type",
                "type" : "string"
            },
            {
                "name" : "children",
                "type" : {
                    "type" : "array",
                    "doc" : "Store the indexes of the children nodes.",
                    "items" : "int"
                }
            }
        ]
    }
}