[Tagging] Implied oneway tag for highway=*_link, wiki edits

Martin Koppenhoefer dieterdreist at gmail.com
Fri Nov 27 10:36:22 GMT 2009

2009/11/27 Jonathan Bennett <openstreetmap at jonno.cix.co.uk>

> Martin Koppenhoefer wrote:
> > no, IMHO we shouldn't generally "imply" but tag explicitly, otherwise
> > consistency is at risk.
> If the tags implied by another tag were documented in a standard form,
> in a central place (so any application, editor, render, etc. could read
> it) would that change your mind?
well, maybe yes. If not those defaults are altered every now and then...

> The disadvantage of explicit tagging for everything is massive
> duplication of information. It also means that newcomers may not quite
> get the tagging right, because they assume that a road type which is
> inherently one-way doesn't need explicit tagging.

how do you differentiate for a certain attribute, that it's default and not
just not set? E.g. surface: can you assume that every road with no
surface-tag is paved? IMHO this is context dependant. In Europe you will
assume it is paved, whilst in Africa you might well assume it isn't. (OK,
maybe this is another issue: country/region-specific defaults)

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