Visual Inference Specification Methods for Modularized Rulebases.   Overview and Integration Proposal
  The paper concerns selected rule modularization techniques. Three visual methods for inference specification for modularized rule- bases are described: Drools Flow, BPMN and XTT2. Drools Flow is a popular technology for workflow or process modeling, BPMN is an OMG standard for modeling business processes, and XTT2 is a hierarchical tab- ular system specification method. Because of some limitations of these solutions, several proposals of their integration are given. 
Krzysztof Kluza, Grzegorz J. Nalepa and {\L}ukasz {\L}ysik
cs.AI cs.SE