1) If the ditch you added has a common node (common point) with an existing powerline, than yes, that means you’ve modified the powerline. But honestly they should not have a common node because they do not physically intersect. 2) Maybe man_made=antenna? 3) Start with simple shapes like a square - you can always modify it later and add more detail. 4) Add a node to the wall and tag it with toursim=artwork

dkiselev, у меня все работает правило “levels”!~”.” означает “levels не содержит любой символ” “10” содержит любой символ и поэтому не матчится