Import and evaluate a decision from another DMN

[saig0]

I can import other decisions from another DMN file. I can evaluate these decisions with the given import name as a prefix.

---

(DMN 1.4, section 6.3.3, page 34)

[falko]

Interesting feature.

[saig0]

Idea:

• two APIs:
  • stateless: parse(dmn) + eval(parsed-dmn)
  • stateful: deploy(dmn) + eval()
  • including Java APIs
• new dependency for the engine: decision-repository
  • deploy() + findByName() + findById() + findAll() + remove()
  • default implementation: in-memory-decision-repository

[falko]

The primary concepts that DMN offers for calling imported elements are BKM and Decision Service invocations.

[falko]

There should be examples in the machine-readable files included with the spec as well as in the DMN TCK. If not, those would be great test cases to add ;-)

[saig0]

Yes, the DMN TCK has two test cases. Both are linked with this issue.

[saig0]

There is an open contribution to implement this feature: #215.

I also drafted a PoC to show how the feature can be implemented but with a different approach: #222.