[Tagging] number of bollards in a line

[Kieron Thwaites]

> I wonder if we should define a special key such as bollard_count=12 (used
> 3x)
> or keep it generic as count=12 (used 1000x, 121x in combination with
> barrier)?

As much as I'm in favour of the generic count=*, there could be cases
where it is not clear what count=* is referring to.  On the other
hand, I believe that defining a special key such as bollard_count=*
could be overkill.

Perhaps count:bollard=* would be the best of both worlds?

--K