[Tagging] "Relations are not categories" excepted for "type=network" ?

Pieren pieren3 at gmail.com
Tue Jul 15 15:58:28 UTC 2014

I discover that OSM contains 1575 relations of "type=network"
(taginfo). I guess its definition is coming from this wiki proposal:

"A network groups together routes that share common characteristics,
e.g. a common operator, a common classification scheme (e.g. E-road
network: "E 1", ..., "E 999"), ... "

"Use cases

Person A sees a bus route with number 217 and wonders how many other
bus routes exist in that city.

Renderer M wants to render all German motorways using white font on
blue sign (official layout), and all E-roads with white font on green
sign. This can be implemented by adding rules for  20614 (view, XML,
Potlatch2, iD, JOSM, history, analyze, manage, gpx) and  20645 (view,
XML, Potlatch2, iD, JOSM, history, analyze, manage, gpx).

Renderer M wants to render all cycle routes that belong to the
"D-Netz". However, there are a lot of other national cycle routes as
well. "

Plus some attached relations examples very explicite.

As raised in the "discussion" page, is that not exactly breaking the
"relations are not categories" ([1]) principle ? Can we delete such
relations when we meet them ?


[1] http://wiki.openstreetmap.org/wiki/Relations/Relations_are_not_Categories

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