[OSM-newbies] Implicit properties

[Thomas Meller]

I proposed a project to get rid of that unlucky situation.
Up to now, usability and legal access restrictions are messed up in the descriptions in the wiki. Some like it, others don't. So data is interpreted differently.

We'll see whether someday we can get rid of such ambiguities.
Be patient, though.

I suggest you tag strictly following the descriptions on the wiki.
If we do shit, let's do it everywhere, consistently.
;-)

Thomas

-------- Original-Nachricht --------
> Datum: Wed, 24 Mar 2010 12:01:31 +0000
> Von: Nicholas Shanks <contact at nickshanks.com>
> An: newbies at openstreetmap.org
> Betreff: [OSM-newbies] Implicit properties

> A post to this list recently stated that highway=footway implied
> bicycle=no. This surprised me as I had assumed that if a ‘bicycle’ property was
> not present, then nothing could be assumed as to whether bikes were or were
> not allowed (and I would assume I could ride my bike there until stopped
> by a policeman).
> 
> After some consideration I decided that I would like Potlatch & JOSM to
> display, after the explicit properties that I have entered, and a break or on
> a different background, all the implicit properties that the current
> properties entail. If I were to then edit one of them, it would move from the
> implicit list to the explicit list.
> 
> How do I bring such a feature to the attention of the Potlatch or JOSM
> developers?
> 
> 
> Here are the modes of transport that I know of which can be applied to a
> path (with values of designated, yes or no—I don't understand the
> difference between ‘permissive’ and ‘yes’):
> foot
> horse
> bicycle
> motorcar
> 
> and some that I've never seen except on the wiki:
> wheelchair
> motorcycle
> motor_vehicle
> snowmobile
> dogsled
> ski
> atv (the ESA space cargo vessel?)
> 
> So for example, does highway=bridleway imply:
> horse=designated, foot=yes, bicycle=yes, everything_else=no?
> 
> One would logically assume that highway=steps implies:
> foot=yes, ed_209=no, everything_else=no ?
> 
> As is often mentioned on
> http://wiki.openstreetmap.org/wiki/Tag:highway%3Dpath/Examples the lack of a specific property can mean either yes or no
> depending on jurisdiction. The properties that this applies to should be so
> marked in the editors.
> 
> There are hundreds of others I can cite, which are not all ways;
> Does highway=street_lamp imply lit=yes?
> 
> -- 
> Nicholas.
> 

-- 
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