+
+ exgroup = parser.add_mutually_exclusive_group()
+ exgroup.add_argument("--print-dot", action="store_true",
+ help="Print workflow visualization in graphviz format and exit")
+ exgroup.add_argument("--version", action="store_true", help="Print version and exit")
+ exgroup.add_argument("--validate", action="store_true", help="Validate CWL document only.")