Looking at the patchy documentation, one is not sure if jBPM obsoletes Rule Flows?
If Yes, what about ruleflow-group attribute in the Rule definition (.drl file) in Drools Expert?
Can one be able to just convert a .drl file into a jBPM file? jBPM supports Process and Rule integration.
there is a business rule task in BPMN2 that handles integration with rules so you can compose your process with business rule tasks and that would be like pure rule flow I guess.
HTH