Hi, Mario, I am a bit confused because it says that "boundary" should be used in admin-political cases but also "nature protection and similar boundaries", and since I usually create "similar boundaries" by mapping heritage protection "sites" and entire "zones" which include not only building multi-polygons but also surroundings, and such places in topographical terms do not differ from zones of "nature protection and similar boundaries", I thought it can be tagged as "boundary" - another reason for choosing "boundary and "protected area" for such relations is that this is the only configuration that I am able to set up that then could be rendered with "map frame" on Wikipedia.  I am not sure who "corrected" these 3 or 4 relations that I created in last few days, but these are completely dismantled and as such irrelevant for the reason they were created in the first place as "protected heritage zones", and above all I am now practically in fear of turning myself into pariah if I try to recreate those to give them back some sense. For example, what the heck is this now: https://www.openstreetmap.org/relation/17674019/history/3 - it's nothing without the building; only building and the area surrounding it in relation has some meaning as a protected heritage zone. Sorry, this is a long reply so I will stop here, though I have few more points to share.