(In reply to Oliver Kellogg from comment #73)

> Created attachment 87920 [details]
> Demo file for the format generated by Embarcadero's "Describe" UML tool
> [...]
> Umbrello does not complain on loading - but nothing is actually imported.

The following changes add support for loading the demo file:

umbrello/{association,classifier,enum,operation,package}.cpp function load()
- Support special tags used by Embarcadero Describe.

umbrello/object_factory.cpp function makeObjectFromXMI()
- Support association special tag <UML:Aggregation> used by Embarcadero.

umbrello/umldoc.cpp
- In function loadFromXMI(), support <UML:Model> equivalent tag <UML:Project>
  used by Embarcadero Describe.
- In function loadUMLObjectsFromXMI(), support <UML:Namespace.ownedElement>
  equivalent tag <UML:Element.ownedElement> used by Embarcadero Describe.

umbrello/umlobject.cpp fuction loadFromXMI()
- Generate new UniqueID for all cases of non existent xmi id.
- Downgrade non existence of xmi.id from error to warning.

CCBUG:56184