[OSM-dev] way 7062297, is this new?

Andy Robinson (blackadder-lists) ajrlists at googlemail.com
Thu Oct 9 10:02:44 BST 2008

Points noted Hugh but in reality it's probably easy enough to find
alternative solutions to these tagging questions. Since duplicate keys in
the current data have essentially been legacy data or input errors of some
sort I suspect the number that exist right now is quite low. That's why I
say it's an easy decision to drop duplication support going forwards. I
think if folks made a compelling reason to keep it and had the patches for
the editors to enable widespread use then it would need to be looked at and
debated a bit more, after all it's the needs of the contributors of data
that should be driving the format of the database, not the other way around.



>-----Original Message-----
>From: dev-bounces at openstreetmap.org [mailto:dev-bounces at openstreetmap.org]
>On Behalf Of Hugh Barnes
>Sent: 09 October 2008 7:35 AM
>To: dev at openstreetmap.org
>Subject: Re: [OSM-dev] way 7062297, is this new?
>On Thursday 09 October 2008 16:06:39 Andy Allan wrote:
>(I think Grant said this bit, it's lost its context)
>> >> Allowed via the 0.5 API currently: Yes.
>> >> Supported by any of the editors: No (AFAIK)
>> >>
>I could swear I explicitly read endorsement of duplicate keys on the
>documentation somewhere, but as usal I've lost it ;~)
>Spurred on by this, I tried it in Merkaartor. The UI accepted my input and
>assumed all was good. I just remembered to follow this up and it appears
>data didn't make it. Possibly the last occurrence of the tag in the app was
>the one that got submitted.
>I don't think last time I tried Potlatch the interface would let me do it
>> >> On a hunch, don't expect the 0.6 API to support duplicates.
>> >
>> Until duplicate keys are prohibited by the API (as Grant
>> suggests, likely in 0.6), then your system will just need to cope.
>Can we talk about why they should be banned? It's a perfectly valid
>construct to have multiple values for a property (key) for a single object.
>Alright, you want examples?
>1) The one I mentioned above is a main street and also a highway. I has two
>names. (Don't ask me what the renderers do with that, it's not the issue.)
>Someone has told me that maybe there's a tag for local or other alternate
>names. I still think it's possible to have two names.
>2) I'm listing lots of a) features and b) routes served on bus stops. So I
>might say that the bus stop has, for simplicity, feature=bin and
>feature=seat. I might say it serves route=123 and route=456. I think
>will suggest I delimit my values. I could do that, but we should be
>XML that is easy to use with DOM or XPath alone. Using delimiters adds
>parsing work on top. Why do you want that in an API?
>3) I'm sure there are others. There's always others. The world is complex.
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