Chain of command "join points"
------------------------------

         Key: HIVEMIND-130
         URL: http://issues.apache.org/jira/browse/HIVEMIND-130
     Project: HiveMind
        Type: New Feature
  Components: library  
    Versions: 1.1    
    Reporter: Howard M. Lewis Ship
    Priority: Minor


The usefulnes of chain of command could be extended by adding "join points" to 
the command chain.  I would define a join point as a no-op command that exists 
just for ordering other commands in the chian, i.e.:

<command id="group-a-1" before="group-b-join" ...>
<command id="group-a-2" before="group-b-join" ...>
<join id="group-b-join"/>
<command id="group-b-1" after="group-b-join" ...>
<command id="group-b-2" after="group-b-join" ...>


Of course, the joins themselves shoudl honor before and after attributes.  The 
joins become a skeleton, that organize complex command chains into stages.

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