The following from the doc is confusing.  It seems both a signalling task and a 
blocking task cannot leave the node until completed.  What is the difference?  
Are the terms blocking and signalling just descriptive and the actual behavior 
defined by the six signal-properties (last, last-wait, first, first-wait, 
unsynchronized, never)?

anonymous wrote : 11.2.2. Task instances and graph execution
  | Task instances are the items in an actor's tasklist. Task instances can be 
signalling. A signalling task instance is a task instance that, when completed, 
can send a signal to its token to continue the process execution. Task 
instances can be blocking, meaning that the related token (=path of execution) 
is not allowed to leave the task-node before the task instance is completed. By 
default task instances are signalling and non-blocking. 
  | 

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