Martin, the purpose of my discussion is not to nit-pick on the illustrative 
extra tags,
but to discuss

   leisure=ducking

vs.

   leisure=sports_centre
   sports_centre=ducking

Anything else was just

Martin Koppenhoefer wrote on 2016/01/05 12:02:
 > I think that this approach is not working well, as there is no "natural" logic for 
subtags like "sports_centre".
>  Have a look in taginfo and discover, that "commercial" is a common value for this key, 
nothing that would fit well together with "aquatics" .

I had of course, and so far sports_centre=* is used 51 times, 24 of them "gym" and 5 
"commercial".
This is some natural noise for an undocumented tag that has some sporadic use.

    * leisure=sports_centre
    * sports_centre=golf_course

-1, there's no gain from this (IMHO), just the loss of having to use 2 tags 
rather than one.

Yes the disadvantage of having more structure is at least a second tag.
It works well in some schemes, look at social_facility.

why would you need sport=golf for objects with a "golf" key?

Maybe we don't, that would be subject to refined discussion once we have an 
opinion
about the principal issue.

tom


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