Yes please!
I was also thinking on the lines of documenting implicit tagging:
* to save mappers time
* to save space in the database
* to avoid confusion
* to allow a single point of maintenance
At a generic "territory" level with some kind of hierarchy please, so
for example cities can override counties which can override states which
can override national rules. As traffic rules are made by some kind of
government, I am sure the current boundary/admin_level stuff can be used
as a base as long as a true hierarchy can be found (no multiple
inheritance!)
<defaults territory="uk">
<defaultentry>
<match>
<tag k="highway" v="motorway" />
</match>
<implies>
<tag k="foot" v="no" />
<tag k="maxspeed" v="70 mph" />
<tag k="bicycle" v="no" />
</implies>
</defaultentry>
</defaults>
Technically it doesn't seem that difficult.
Colin
On 13/04/2012 07:27, Stephen Hope wrote:
The problem with this, is many mappers are not even aware of what
implicit assumptions they are making, and hence won't map them. Saying
that they should map them won't help.
Do we need a database* of explicit default settings for different
areas, to be used by renderers, routers and other tools as
appropriate? Rules like "In Germany, motorway implies foot=no if there
is no foot tag on the way". This could also help give sane guesses of
defaults for roads that haven't been tagged at all yet.
* either a separate database, or polygons inside OSM with tags,
whatever. That's not the point at the moment
Stephen
_______________________________________________
Tagging mailing list
Tagging@openstreetmap.org
http://lists.openstreetmap.org/listinfo/tagging
