Here, I am sharing JBPM 5.1 data models that I created by reverse engineering (using SQL Power Architect) in case others may find them useful.
JBPM 5.1 Process Data Model
http://community.jboss.org/servlet/JiveServlet/downloadImage/2-627776-17027/450-303/jBPM_ProcessDM.GIF
JBPM 5.1 Human Task Data Model
http://community.jboss.org/servlet/JiveServlet/downloadImage/2-627776-17028/450-326/jBPM_HumanTaskDM.GIF
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