While browsing a changeset I came by the word “way” used as a key. For the object the value was identical to the way (element) id. But this is not true for all uses, other values do occur.
As way, as a key, has no wiki page I looked a bit further (overpass and taginfo) but I am unable to get a clear meaning. Curiously enough it does exist as a wiki item (Q4636) but that has no description so is of not much help either
Some appear to be tagging mistakes, some random samples:
- Way: 449994150 here it should probably be
highway=service
. - Way: 1108957015 should probably be
man_made=bridge
and/orhighway=?? + bridge=yes
Can anybody shed some light on it?