[Tagging] Discussion about Multivalued Keys

Bryan Housel bryan at 7thposition.com
Wed Jan 27 17:16:16 UTC 2016

Hmm, I think the semicolon separated tags are necessarily ordered.  Jochen has it a bit wrong in the blog with his example about coincident highways.

For example US 1-9 by NYC is tagged `ref=US 1;US 9`.  It would be a mistake to treat that as equivalent with US 9-1, as it’s definitely not called that nor signed that way:  http://www.openstreetmap.org/way/51509994 <http://www.openstreetmap.org/way/51509994>

I’m sure there are other examples of this, where the ordering of coincident highway refs would look totally wrong if reversed.

> On Jan 27, 2016, at 11:36 AM, Frederik Ramm <frederik at remote.org> wrote:
> Hi,
> On 01/27/2016 04:09 PM, Colin Smale wrote:
>> I have created a proposal page as a channel for constructive debate
>> about the way forward. I hope you will all take a look and participate!
> One thing that I would like to see discussed is ordering. For example in
> the semicolon word, is "shop=a;b" the same as "shop=b;a" or does the
> former mean that it is an "a" with attached "b" and the latter mean that
> it is a "b" with an attached "a"?
> If a;b is identical to b;a then having both is of course a major pain
> and would shift a lot of preprocessing work on tools like taginfo.
> On semicolons, also see
> https://blog.jochentopf.com/2013-09-23-semicolons-in-osm-tags.html
> Bye
> Frederik
> -- 
> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"
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