1. Experiences in enhancing existing BPM Tools with BPEL Import and Export Jan MendlingVienna University of Economics Kristian Bisgaard LassenUniversity of Aarhus Uwe ZdunVienna University of Technology

2. Folie 2 You have to support BPEL… 2. Enhance… Export Import 1. Native BPEL Engine Store Load No arbitrary cycles

3. Folie 3 Agenda 1.How to design BPEL import and export? 2.How to apply Transformation Strategies? 3.Beyond transformation strategies 4.Conclusion

4. Folie 4 Agenda How to design BPEL import and export?

5. Folie 5 A BPEL Process

6. Folie 6 A BPEL Process: Structured Activities+Links

7. Folie 7 Recent Papers X to BPEL: Baina et al.: Model-Driven Web Service Development. In CAiSE 2004. Gardner. UML Modelling of Automated Business Processes with a Mapping to BPEL4WS. In First European Workshop on Object Orientation and Web Services at ECOOP 2003. Hofreiter and Huemer. Transforming UMM Business Collaboration Models to BPEL. OTM Workshops 2004. Mendling and Hafner. From Inter-Organizational Workflows to Process Execution: Generating BPEL from WS-CDL. OTM Workshops 2005. Moon et al. Transformation Algorithms between BPEL4WS and BPML for the Executable Business Process. In WETICE 2004. van der Aalst, Jørgensen and Lassen. Let’s Go All the Way: From Requirements via Colored Workflow Nets to a BPEL Implementation of a New Bank System. In CoopIS 2005. White. Business Process Modeling Notation (BPMN). Specification, BPMI.org, 2004. Mendling, J. Ziemann: Transformation of BPEL Processes to EPCs. In EPK 2005. Koschmider, von Mevius: A Petri Net Based Approach for Process Model Driven Deduction of BPEL Code. OTM Workshops 2005. BPEL to Y: Hinz, Schmidt, and Stahl. Transforming BPEL to Petri Nets. In BPM 2005. Mendling and Ziemann. EPK-Visualisierung von BPEL4WS Prozessdefinitionen. In Workshop on Software Reengineering, 2005.

8. Folie 8 Important Properties Structured Process Graph Acyclic Process Graph Structured BPEL control flow

9. Folie 9 Transformation Strategies for Export

10. Folie 10 Transformation Strategies for Import

11. Folie 11 Agenda How to apply Transformation Strategies?

12. Folie 12 Proprietary Workflow Designer Element Preservation Strategy

13. Folie 13 Extra Elements of the Workflow Designer Sub-workflows Paste the subprocess into a BPEL scope Specific predefined step actions Abstract step action class as default Overridden for specific step actions, e.g., BPELJ for Inline Java Additional Step Node attributes Annotated to BPEL activities as attributes in a different namespace

14. Folie 14 Illustration of the export

15. Folie 15 Agenda Beyond transformation strategies

16. Folie 16 Further Approaches for Graph to BPEL C. Ouyang, M. Dumas, S. Breutel, and A. H.M. ter Hofstede. Translating Standard Process Models to BPEL. In Proceedings of the 18th International Conference on Advanced Information Systems Engineering (CAiSE), LNCS, 2006. Idea: Calculate precondition sets for every activity Send completion message to itself Event handlers activate the next activity Limitations: Re-Import of such BPEL is difficult

17. Folie 17 Further Approaches for Graph to BPEL II Zhao, W., Hauser, R., Bhattacharya, K., Bryant, B. R., and Cao, F. (2006). Compiling business processes: untangling unstructured loops in irreducible flow graphs. Int. Journal of Web and Grid Services, 2(1):68-91. Idea: Transform unstructured to structured models Limitations: Not always possible if concurrency is in the model

18. Folie 18 Agenda Conclusion

19. Folie 19 Conclusion Transformation strategies… provide systematic initial approach have to be extended and adapted BPEL not directly suited for exchanging workflow models BPEL extensions like BPEL4People, BPEL-SPE, BPELJ help Further information has to be annotated

20. Folie 20 Agenda Thank you