Is it possible to create a filter that only shows buildings that have more tags then 1 or 2 definede tags
For example: how do I create a filter that shows just the buildings that have OTHER tags then : building=* or shop=*
Yes, it's possible. But you need to use the filter rule building blocks creatively.
Let's first search for elements with building=* and 2 or more tags (= at least one tag besides building=*):
This will of course still include the buildings with shop=* tag. Therefore, we exclude shops from the result:
building=* -shop=* tags:2-
Now we almost have what we want. What's still missing is elements with building=* and shop=*, but also at least one other tag besides these two. So we simply add these using OR.
( building=* -shop=* tags:2- ) OR ( building=* shop=* tags:3- )