If the individual pitches are part of a campground that has a street address 
then in makes sense.

But many campgrounds run by the US Forest Service and other state and local 
parks do not have street addresses even if they are located on roads. And there 
are backcountry campgrounds with numbered pitches where there is no highway so 
addr:street=* and addr:housenumber=* are impossible to specify.

I consider addr:*=* tags as part of an address namespace that should all work 
together. Using addr:unit=* outside of the context where addr:street=* and 
addr:housenumber=* cannot always be used seems as bad as using ref=* for the 
pitch identifier.

If some variation of the tagging described at 
http://wiki.openstreetmap.org/wiki/Proposed_features/Extend_camp_site#Tagging_of_individual_pitches
 is used the maybe camp_site:identifier=* could be used rather than ref=* or 
addr:unit=*.

There has been a comment on this thread that the tagging there could be 
confusing as tourism=camp_site for the top level would imply that camp_site:*=* 
tags should be about the whole campground rather than an individual pitch. So I 
can see objections to creating a camp_site:identifier=* tag. Maybe all the tags 
in 
http://wiki.openstreetmap.org/wiki/Proposed_features/Extend_camp_site#Tagging_of_individual_pitches
 should be changed from camp_site:*=* to camp_site:pitch:*=*

I haven’t noticed hierarchical name spaces in tag names to that level but don’t 
know a reason whey they could not be used. I would certainly be clear to any 
mapper or data consumer that the value being given was specific to a specific 
pitch in a campground.

Cheers,
Tod

> On Apr 24, 2015, at 12:37 PM, Bryce Nesbitt <bry...@obviously.com> wrote:
> 
> Has the discussion settled on addr:unit + camp_site=pitch?

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