> removed:
>
> (features that do not exist anymore or never existed but are commonly seen
> on other sources)
>
> I propose to remove the part "or never existed but are commonly seen on
> other sources", because this has nothing to do with "removed". If people want 
> to tag easter eggs or errors
> from other maps in the OSM db they should use a distinct tag for it.


Only it was simpler with only one tag to remove a feature from a
ground survey but without first-hand knowledge of the full history or
if it is mentioned still in other sources (imagery, pictures,
cadastre, ...).
If something is mapped on OSM, but you are sure that it doesn't
exist... Do you know for sure if it doesn't exist *anymore* or if it
*never* existed in the first place? Using a distinct tag for absolute
correctness may prevent a simple and worthwhile improvement.

I propose

error:
(features that do not exist but may be seen on other sources)
[generic, catchall for the two cases + leave a trace of the feature to
prevent edit war]

removed:
(features that do not exist anymore but may still be seen on other sources)
[@Martin: leave a mention to the other sources]

eventually a third tag for:
(features that never existed but may be seen on other sources)
but two above may be enough.

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