Dr. Kris Shrishak:

I was specifically referring to the national register in the Netherlands, because there are multiple ones, at the city level and various other levels. The thing I find imperfect in the national register is it is not mandatory. The registering mechanism is based on what one might call a gentlemen's agreement among the departments they will do the right thing, but it is not mandatory. That has been one of the big concerns there. Despite that, more 1,000 systems have been registered.