[Tagging] waterway=lock_gate - is it only for nodes?

[Mateusz Konieczny]

According to wiki[1] waterway=lock_gate should be used only on nodes. Some
are tagged on
ways[2]. Why wiki considers node as the only valid element where this tag
may be used? Is it
because page is older than mapping rivers also as areas? Routing for boats?
Some other reason?

Is it a good idea to change wiki and mark tagging on nodes as a good idea?
Is it a good idea to
promote tagging also on ways[3]?


[1] http://wiki.openstreetmap.org/wiki/Tag:waterway=lock%20gate
[2] http://taginfo.openstreetmap.org/tags/waterway=lock_gate
[3] https://github.com/gravitystorm/openstreetmap-carto/pull/991
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