Add Constraint forbidding AasReferables as value for external references #592
Description
Is your feature request related to a problem? Please describe.
see admin-shell-io/submodel-templates#79 (comment)
The following working example is definitely is wrong although it seems no constraint is violated
(GlobalReference)) submodel/id
(SubmodelElementCollection) smc
(File) file
(FragmentReference) tag
The following two examples are correct:
(Submodel)) submodel/id
(SubmodelElementCollection) smc
(File) file
(FragmentReference) tag
(GlobalReference) path to file
(FragmentReference) tag
Describe the solution you'd like
Add Constraint forbidding to use any element from AasReferables if the first Key equals to "GlobalReference".
Constraint AASd-xxx: For external references, i.e. References with Reference/type = ExternalReference the value of any Key/type contained in the Reference shall not be one of AasReferables.
- add an invalid example
- explain that to use a ModelReference instead
Although adding new constraints typically is non-backward-compatible I consider this change just to be clarification because semantically everything else does not make sense.