Abdelkarim Erradi Piyush Maheshwari Vladimir Tosic Policy-Driven Middleware for Manageable and Adaptive Web Services Compositions. 2007 BPM (Demos) http://ceur-ws.org/Vol-272/BPM07DemoProgramPaper5.pdf conf/bpm/2007d db/conf/bpm/bpmd2007.html#ErradiMT07