On 11/7/18 2:27 AM, Dave Swarthout wrote:
I provided two examples from the Wiki and a part of a response earlier
in this thread from Kevin Kenny to support my argument that state that
individual ways in a multipolygon or relation should not be tagged
unless their characteristics require it. If you're working with a
route=road and the surface changes, you split the way and mark it so.
Same with maxspeed or number of lanes. The characteristics are those
of the way, not the entire route, and rightly belong only on the way.
In the case of the pipeline, tags like man_made=pipeline,
substance=oil, operator, Wikipedia and Wikidata tags, belong in the
relation. The people who first added the pipeline to OSM did it both
ways, probably to guarantee that it would be visible to OSM or other
data consumers, but I don't know.
That isn''t quite what I said.
What I said is that attributes that conceptually *might* be different on
separate ways of a relation belong on the ways. What goes on the
relation are the things that define it as a relation.
For a multipolygon, that's everything. A multipolygon is nothing more
nor less than an area feature with any topology more complex than a
simple closed way. The way gets tagging only if there's stuff that
really belongs to it; an example would be an administrative region that
ends at the coastline.
For a route, what goes on the relation is specifically the name of the
route (if it has one that might be separate from the names of the
constituent ways - for example, the Erie Canalway briefly follows State
Street), the network, the reference number, and any descriptive
information such as operator, website, length, hours, ... The physical
attributes (highway=*, surface=*, etc.) go on the component ways.
For a group, it's even less. The Great Lakes relation has pretty much
just a name and the component relations for the individual lakes.
Sorry if my earlier explanation was confusing.
_______________________________________________
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging
