Also you can look at the following examples to see how the ftl templates are used:
http://community.jboss.org/people/bpmn2user/blog/2011/02/27/jbpm5-console--hello-process-example
http://community.jboss.org/people/bpmn2user/blog/2011/02/21/jbpm5-example-for-forms-with-variables
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