[Wiki Loves Monuments] about identifiers

So what do I suggest you do instead? As I said, we're facing a similar (if not worse) situation in Germany. We have literally more than one thousand institutions and authorities that issue monument lists for areas ranging from single municipalities to whole states (in total, there are about 1 million monuments). Many of them do assign numbers, but they all start with 1, so we have the issue that the IDs are not unique. What we're going to do now that we have enough lists on Wikipedia: We will use an already existing numbering scheme called the Gemeindekennziffer which assings a unique code to each municipality as a prefix to the official IDs. (The actual system is a little more difficult, in fact, the Gemeindekennziffer is structured into different parts, for example the first to numbers tell you what state the municipality is in and so on. Therefore we'll just use the first two numbers of the code as the prefix for states that have unique IDs already.) This way, the IDs on Wikipedia and on Commons stay the official ones, only inside the database we add a prefix which is not OR but based on an official numbering scheme. I'm sure that you can find a similar numbering system for Italy!