Index Note: Page numbers followed by f indicate figures and t indicate tables A Abstract syntax, 87, 90­92, 370­371, 554 Accept event action description of, 224, 246 node, 580t Accept signal action, 224, 226 Accept time action node, 580t Action Language for Foundational UML (Alf), 228, 245­246, 249 Action pins, 359­360 Action(s) accept event. See Accept event action accept signal, 224, 226 call. See Call actions control operators used to enable and disable, 222­223 definition of, 205, 208 example of, 208 node for, 586t with nonstreaming input and output, 222­223 opaque action, 221­222 primitive, 246­247, 247f description of, 30, 30f example of, 207f invocation actions on, 212f nodes, 578t, 580t paths, 581t purpose of, 578­581 residential security system, 470f use case and, 311­312 Activity final node, 221, 579t Activity flow, 238f Activity hierarchy block definition diagrams used to model, 240­242 description of, 207f, 208 Activity parameters description of, 209­210 nodes, 210, 211­213, 219, 578t Activity partitions allocate, 62­64, 357­358 description of, 62, 234­236, 235f, 311 node, 578t Actor