AMSMF2 — AMS_RTSWIndication unpractical/incorrect definition

AMS_RTSWIndication unpractical/incorrect definition The attribute ElementCase equals the discriminant of the union Element and should be removed. As an preferred solution, the union can be replaced by just one string indicating the referenced topic, the union cases only differentiate in naming of the attribute, not the type. This allows setting a query on this field. The keylist is also incorrect, a union may not be part of the keylist. AMS_RTSW should also not be part of the keylist because an Element can have only one state at a time.

Replace the union Element with a struct as proposed. Modify the keylist as proposed as well.