"alex.guizar(a)jboss.com" wrote : I see a number of similarities between the proposed business keys in jPDL, natural IDs in Hibernate and correlation sets in BPEL. | i think in most cases, a single String property that is defined upfront is sufficient. In case you want the full bpel correlations, you still could use that single property business key as a reference to a set of correlations. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4017489#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...