Yo,

Thanks for your kind words! I think I disagree a layer tag should be 
encouraged. The main issue when I think of this is layers tend to go 
sequentially, without a common definition of height. 

If I have a post with a pedestrian crossing instructions 
(traffic_sign=US:R10-3b), what level would that be? 

What if that sign was at eye level but the only other thing on the pole was a 
street light (highway=street_lamp)? 

What if, in the future, the city decides to put a traffic camera 
(man_made=surveillance) here? Would the street lamp then jump a level because 
the camera now exists between the 2? 

What determines the standard height on layer 1 for the sign?

`height=*` addresses this nicely however we don't all walk around with a 
measuring wheel and protractor (just me, surely... right?). However imperfect, 
I think the order of the relation makes the most sense as it conveys the layer 
the element is on in *relation*  to the rest of the pole, instead of to the 
rest of the world.

As far as overlapping nodes, or nodes sharing a lat/long perhaps someone more 
experienced that I can chime in, but this seems not to be a huge issue to me. 
In reality, all the elements in a mast relation will exist at the same lat/long 
because their differentiator is in the vertical axis not captured in lat/long 
(no, we really don't have enough time for this tangent.)

> what about a tweak of
> https://wiki.openstreetmap.org/wiki/Proposal:Node ?

That's the goal! And I would love to work with Martin on this as he made the 
original proposal, just fielding some opinions before work on the more formal 
proposal and feedback like yours is exactly what I am after!

-- GA_Kevin (everywhere)

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