without \$1 : get all attributes (send to outlet 0) with \$1 : get one specific attribute (and send to outlet 0 as well) an attribute. in get \$1, no such attribute was found. creation arguments will be added eventually. set or create an attribute (whose name is the selector) set or create an attribute (whose name is \$1) ; UNIMPLEMENTED! remove attribute whose name is \$1. it will not appear anymore in 'get' until it is recreated (if ever it is)