Hi all, I don't know if it can be of any help but in France, every monument has an id (or some times more than one if different parts of a monument are classified), but every monument can be identified by at least one id.
These ids aren't integer, they look like PA00083476.
Sylvain
2011/3/13 Ziko van Dijk zvandijk@googlemail.com
Oh, that is a problem in Germany too. The greatest we can dream of are unique ids in a state. But within a state, they often have ids only within a municipality. Ziko