[Tagging] Layer=* tags disappearing

[Nathan Edgars II]

On Tue, Oct 12, 2010 at 11:26 AM, Pieren <pieren3 at gmail.com> wrote:
> "layer" is just saying what is on the top when two objects/lines are
> crossing each other. If you have only one element, the layer tag is really
> optionnal (this until someone is tracing what is below).
Even if you have two elements, it's obvious which is above the other
if only one is bridge=* or tunnel=*. The purpose of the layer tag is
to resolve ambiguities when two above-ground or two below-ground
features cross.

> And we can also put the layer tag on the element under the bridge.
Remembering of course that the ground is layer=0, so unless something
under a bridge is in a tunnel it too is layer=0.