attributes.schema

{
    "type": "map",
    "required": true,
    "mapping": {
        "chef": {
            "type": "map",
            "required": true,
            "mapping": {
                "servers": {
                    "type": "map",
                    "required": true,
                    "mapping": {
                            = : {
                                "type": "map",
                                "required": true,
                                "mapping": {
                                    "server_url" : { "type": "str" },
                                    "client_name" : { "type": "str" },
                                    "client_key" : { "type": "str" },
                                    "description" : { "type": "str" },
                                    "order" : { "type": int }
                                }
                            }
                    }
                }
            }
        }
    }
}