Webwatcher,
that's a very interesting approach using metadata.
That calls for another question: which field?
Maybe a field like 'Status' would be appropriate, values=validated lvl1, not validated, etc.
Check
http://dublincore.org/documents/dces/
Status is not given, but the Coverage element may be appropriate:
Definition: The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant.
Comment: Spatial topic may be a named place or a location specified by its geographic coordinates. Temporal period may be a named period, date, or date range. A jurisdiction may be a named administrative entity or a geographic place to which the resource applies. Recommended best practice is to use a controlled vocabulary such as the Thesaurus of Geographic Names [TGN]. Where appropriate, named places or time periods can be used in preference to numeric identifiers such as sets of coordinates or date ranges.
What do you think?