Is there a metamodel behind this? Something that says (simplistic
example) there are "objects" which have "properties" and "links to /
relationships with other objects"? And how this might map to OSM
entities and their tagging? 

IMHO something like this as a "poster on the wall for every mapper"
might help resolve many tagging disputes where there are conflicting
paradigms leading to a shouting match whereby the one with the loudest
voice wins that battle, but leaving the war going on... 

On 2015-09-10 09:18, Martin Koppenhoefer wrote: 

> sent from a phone
> 
>> Am 10.09.2015 um 02:20 schrieb Warin <[email protected]>:
>> 
>> Using that logic
>> 
>> a parking area is a property of a parking aisle.
>> 
>> a fuel station is a property of a driveway.
>> 
>> and so on.
> 
> doesn't seem logical to me, but if you see it like this you might want to 
> propose properties for these ways to add that information.
> 
> Like
> xy area object tags +
> fenced=yes
> 
> is an implicit fence (property) and
> 
> barrier=fence is an explicit fence (object), and both are valid tags.
> 
>> Bridges, tunnel and cuttings are physical objects that have their own 
>> properties (names, heights, widths, materials etc)
>> that can be independent of whatever else they may be related to.
> 
> yes, and to store these own properties in a common way you likely should map 
> these objects on their own.
> 
> For a bridge the tag is
> man_made=bridge
> 
> if we don't have yet tags to map explicit tunnels and cuttings, these could 
> be introduced (maybe there aren't own properties on these objects that 
> mappers so far wanted to map, hence no tags have yet been introduced).
> 
> cheers 
> Martin 
> _______________________________________________
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> [email protected]
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