BPMN Interchange Validation Techniques
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The document discusses validation of BPMN models during interchange between modeling tools. It describes using pixel-based image diffs, DI-based diffs, XML validation, and semantic model validation using meta models to check for differences in imported and exported models. Common interchange problems mentioned include missing or changed element IDs, incorrect ordering of DI elements, and semantic errors like pools referencing processes.
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BPMN Interchange Validation Techniques
- 1. BPMN Interchange Validation Falko Menge camunda services GmbH 1 February 201 3 3
- 2. Agenda 1. Creating Reference Models 2. Validation Process 3. Diagram Validation 4. Semantic Model Validation 1. XML 2. BPMN Meta Model 5. Common Interchang Problems
- 3. Creating Reference Models Which modeling tool to use? Requirements: −PNG export - Symbols close to the BPMN Spec - No colors - No shadows - No 3D icons −XML export - Schema-valid - Conform to BPMN 2.0 Spec −API for automation of hundreds of test cases
- 4. Validation Process: Import Only
- 5. Validation Process: Export Only
- 16. Pixel-based Diff: Transparent Overlay
- 17. Pixel-based Diff: Example Reference
- 18. Pixel-based Diff: Example Result with Missing Elements
- 19. Pixel-based Diff: Perceptual Image Diff $ perceptualdiff reference.tif vendor.tiff -output diff.ppm FAIL: Images are visibly different 696 pixels are different
- 20. Pixel-based Diff: ImageMagic ImageMagic: $ compare reference.png screenshot.png diff.png
- 23. Pixel-based Diff: Discussion Pros: −Spots even slightest differences (could detect encoding problems) −Open Source tools available: ImageMagic, PerceptualDiff Cons: −Too pedantic (we dont want to make all tools look exactly the same) - Could be solved by re-import to reference modeling tool −Bounding box detection and cropping needed - Open Source implementation of algorithm available: camunda fox
- 24. DI-based Diff Normalize DI and compare positions and dimensions Open Source implementation of algorithm available: camunda fox
- 25. DI-based Diff Can also be used as an overlay to highlight differences in a model
- 26. XML Validation 1. XML Schema validation 2. Check if elements still are present & have same IDs and attributes 3. XML Diff using tools like XMLUnit for Java −One defines rules of what is considered equal in XML through so-called Difference Listeners
- 27. Semantic Model Validation 1. Load process with EMF meta model provided by the BPMN Spec - Open Source implementation available: camunda fox quickstart 2. Meta Model Diff - Open Source implementation available: Eclipse EMF Compare - Any difference reported is likely to be an interchange problem
- 28. Semantic Model Validation Meta model comparison even allows for a graphical diff
- 29. Common Interchange Problems Element IDs not preserved Ordering of DI elements Node center instead of upper left corner Unicode Support Wrong semantic element referenced in DI Pool references Process Data Store & Data Object instead of References
- 30. camunda services GmbH Thank you! Zossener Str. 55-58 10961 Berlin Telefon: +49 30 664 0409-00 Telefax: +49 30 664 0409-29 Email: info@camunda.com Falko Menge Consultant, trainer and software developer falko.menge @camunda.com BPMN Interchange Validation 1 February 201 3 3 Blog: www.bpm-guide.de