{
        "type" : "record",
        "name" : "Frame",
        "doc": "Store a node in the hierarchy.",
        "fields" : [
            {
                "name" : "index",
                "type" : "int"
            },
            {
                "name" : "name",
                "type" : "string"
            },
            {
                "name" : "type",
                "type" : "string"
            },
            {
                "name" : "parents",
                "type" : {
                    "type" : "array",
                    "doc" : "frame indexes of parents",
                    "items" : "int"
                }
            }
        ]
}