[Tagging] Feature proposal - RFC - Line attachments

[OSMDoudou]

Notice, one shouldn’t confuse “historical” (exists and is historic interest) with “out of date” (doesn't exist anymore and cannot be verified on the ground) and with “life cycle” (change of state or usage).

Definitions are mine and can be imperfect.

In fact, I want to allude to:

- Open Historical Map: https://wiki.openstreetmap.org/wiki/Open_Historical_Map

- Historic: https://wiki.openstreetmap.org/wiki/Historic

- Lifecycle: https://wiki.openstreetmap.org/wiki/Lifecycle_prefix
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