There is, today, a name value pair. This hints at a broader requirement.
Requirement for a run time solution for one time extensions which may involve structured information or simply name value pairs
There is another requirement for an easy way to extend the model and design time. To meet the first requirement it would be possible to have a key value pair to have structured content in the value.
Software and metadata quality objects
In the administrative information discussion, there is currently a software object and its properties and a metadata quality objects and its properties. these could be objects in the model but they don't necessarily exist at this time. The requirement for this administrative information still exists. Someone call Santa and tell him to bring a lot of coal.