Dear all,
Following a discussion last year about markers subject, particularly pipeline markers, this proposal intends to review the main solution discussed.
https://wiki.openstreetmap.org/wiki/Proposed_features/Markers_subject_refinement
Using subject=* could disambiguate the underground or remote feature the marker refers to.
It is proposed to improve existing subject=* key and made a small replacement of utility=hydrant.
Let’s discuss there or on Talk page