Michael Wohlfart [http://community.jboss.org/people/mwohlf] created the 
discussion

"Re: Variables Scoped only to the Task"

To view the discussion, visit: http://community.jboss.org/message/562453#562453

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Shannon, sorry for beeing not clear about that by "programmatically" I meant 
that you have to do it in Java code and I see no way to do it in the jDPL 
definition, variables in jPDL are execution scoped like HuiSheng said.
HuiSheng, I hacked that in my project but I have other customizations too, so 
not sure if this works in a plain jBPM4.4, however the variable table in the 
database is linked to the task with a hibernate map definition that has 
cascade="all-delete-orphan" so the variable should be deleted when the task is 
removed from the task table... but I am still trying to figure out the details
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