{
    "executable": "/bin/tar",
    "arguments": [ "tar", "-cf", "archive.tar", "a", "b" ],
    "files": [
                {
                    "task_path": "a",
                    "serv_path": "/some/directory/a.txt",
                    "type": "INPUT",
                    "binding": "LINK"
                },
                {
                    "task_path": "b",
                    "serv_path": "/some/directory/b.txt",
                    "type": "INPUT",
                    "binding": "LINK"
                },
                { "task_path": "archive.tar",
                  "serv_path": "/some/directory/archive.tar",
                  "type": "OUTPUT",
                  "binding": "LINK"
                }
            ]
}