[jboss-user] [JBoss jBPM] - assignment expression

[lg-jbpm]

Hello,

I am not sure I understand the meaning of this kind of assignment expression. This is from the jbpm docs, sec 11.11.2

<process-definition>
  |   ...
  |   <task-node name='a'>
  |     <task name='laundry'>
  |    <assignment expression='previous --> group(hierarchy) --> member(boss)' />  
  | </task>
  |     <transition to='b' />
  |   </task-node>
  |   ...


What do the arrows and the 3 terms signify? Is this the order in which the assignment will be processed?  For example, if the previous user is not available to be assigned, pick someone from the group "hierarchy" etc?The doc is not clear to me.:-(

thanks,
lg




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