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task variable or process variable?

Question asked by shaparak-smmira on Apr 15, 2013
Latest reply on Apr 15, 2013 by pkromolowski
hi to all
I confused about this concept:
in bpmn20 ,variables set for usertask for examle in code: 

<userTask id="initiateFlow" name="Initiate Flow" >
        <activiti:formProperty id="request" name="request" type="string"></activiti:formProperty>
        <activiti:formProperty id="status" name="status" type="string"></activiti:formProperty>
        <activiti:formProperty id="goal" name="goal" type="string"></activiti:formProperty>

when deploy and start process in activiti-explorer and set variable in task
in database in "act_ru_variable" table  for each variable set "execution_id_" and "proc_inst_id_" but dont set "task_id_" but in defined process() variable set for usertask !!!

1.whats happen?
2.whats different  between "task variable or process variable"?
3.have runtimeservice method for save all feild?