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govoplan-workflow/docs/BPMN_INTEROPERABILITY.md
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# BPMN Interoperability
GovOPlaN distinguishes BPMN notation and XML interchange from executable
workflow semantics.
## Current Contract
- `GET /api/v1/workflow/bpmn/profile` publishes the exact native support
profile.
- `POST /api/v1/workflow/bpmn/inspect` safely parses bounded BPMN 2.0 XML,
inventories every BPMN model element, detects duplicate IDs and selected
dangling references, and classifies elements as interchange-only, natively
mappable, or natively executable.
- XML entities, DTD-based expansion, oversized documents, and malformed roots
are rejected.
- The native GovOPlaN graph remains the authoritative executable definition.
Inspection is not XML Schema validation and does not claim that every BPMN
semantic construct can be executed. A future `bpmn-js`/`bpmn-moddle` adapter
can provide complete visual notation and XML round-tripping without forcing
unsupported elements into the native runner.
## Execution Boundary
Adding a BPMN shape is not equivalent to implementing its token semantics,
event subscriptions, compensation, transactions, choreography, or conformance
behavior. Each executable mapping therefore needs:
1. an explicit native semantic mapping;
2. validation rules and lifecycle behavior;
3. resumability and idempotency tests;
4. migration and round-trip fixtures;
5. a declared fallback when the installed runtime cannot execute it.
Unsupported constructs remain visible and preserved by the future interchange
adapter, but activation must remain blocked until an execution adapter declares
support.