[Tagging] Waterway direction

[Anthony]

On Wed, Sep 1, 2010 at 2:54 AM, Peter Wendorff
<wendorff at uni-paderborn.de> wrote:
> On 31.08.2010 20:58, David Earl wrote:
>
> Just to throw something else into this discussion...
>   highway=steps
> It doesn't (or at least, isn't documented as) have direction, but _could_
> have in the same way as rivers (direction of way is down the steps, say).
>
> To quote the wiki: (http://wiki.openstreetmap.org/wiki/Steps)
> "Discussion whether the direction of the way should point up- or downhill is
> so far been inconclusive. It's possible to tag this explicitly using
> incline=up or incline=down. An alternative unofficial way has been to use
> direction=up or direction=down, which are equivalent to the incline tags."
>
> I think, incline and direction are both accepted and widely used; I often
> tag both to make it useful to as much applications as possible.
> But there is nothing like "steps are always drawn in direction from low to
> high" - at least that's not documented.

Couldn't incline=up/incline=down work for waterways too?

Then incline=down could be default, and incline=unknown could be added
where the incline is unknown.