2013-02-13 - BPMN Interchange Validation
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BPMN Interchange Validation
Falko Menge
camunda services GmbH
13 February 2013
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1. Creating Reference Models
2. Validation Process
3. Diagram Validation
4. Semantic Model Validation
1. XML
2. BPMN Meta Model
5. Common Interchang Problems
Agenda
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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
Creating Reference Models
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Validation Process: Import Only
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Validation Process: Export Only
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Validation Process: Roundtrip
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Diagram Validation
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Pixel-based Diff: Transparent Overlay
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Pixel-based Diff: Example Reference
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Pixel-based Diff: Example Result with Missing Elements
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$ perceptualdiff reference.tif vendor.tiff -output diff.ppm
FAIL: Images are visibly different
696 pixels are different
Pixel-based Diff: Perceptual Image Diff
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ImageMagic: $ compare reference.png screenshot.png diff.png
Pixel-based Diff: ImageMagic
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Pixel-based Diff: ImageMagic
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Pixel-based Diff: ImageMagic
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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
Pixel-based Diff: Discussion
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Normalize DI and compare positions and dimensions
Open Source implementation of algorithm available: camunda fox
DI-based Diff
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Can also be used as an overlay to highlight differences in a model
DI-based Diff
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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
XML Validation
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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
Semantic Model Validation
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Meta model comparison even allows for a graphical diff
Semantic Model Validation
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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
Common Interchange Problems
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Thank you! camunda services GmbH Zossener Str. 55-58 10961 Berlin
Telefon: +49 30 664 0409-00 Telefax: +49 30 664 0409-29
Email: [email protected]
www.bpm-guide.de Blog:
@camunda.com
Consultant, trainer and software developer
Falko Menge
falko.menge
BPMN Interchange Validation
13 February 2013