I found the piste:grooming description from the 'Piste maps' or the
Key:piste:grooming pages that was derived from the earlier not very
clear. I've made an attempt to re-write it to document actual usage here:
https://wiki.openstreetmap.org/wiki/Talk:Key:piste:grooming#Page_rewrite_proposal
I'd like to have some comments if you think I missed something. This is
about *actual usage* and better comprehension. If the values re-used
from one type of piste to another does not suits you, it's another story
that can be dealt with later.
Yves
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