Let me take a different approach. When I create a ME I can define/build a subsystem having configration, properties, etc...
The subsystem can have runtime changes via jboss-admin.sh. Any objections ?
Now, the subsystem can be build when reading the standalone.xml file OR having a runtime subsystem state - at my understanding. Any objections ?
Then the subsystem state is updated at rutime via OperationStepHandler && "registerOperationHandler(ModelDescriptionConstants.ADD .....", etc.
Now, my question is how a ME service can get the subsystem state after the all operation handlers on that subsystem have been performed ?