[OSM-talk] Syntactic conventions for tags
jochen at remote.org
Thu Jan 1 23:45:10 GMT 2009
On Thu, Jan 01, 2009 at 11:01:48PM +0000, Andrew Chadwick (mailing lists) wrote:
> People often ask what the various colons, underscores, semicolons and
> whatnot mean within a tag. The answer is that there are no guidelines,
> silly; just do what you want! But doesn't mean that de-facto conventions
> haven't evolved over time anyway, so I've had a go at documenting them.
> Could someone please review and let me know if I've missed anything
> important? Better examples would be useful too.
> Thanks. I bet you're all doing something completely different.
> (Actually, I like the colon syntax a lot. Wonder if it's worth
> formalising that a bit more, saying that either order matters, or order
> doesn't matter?)
Of course the order matters, otherwise its a different tag key. The Venn
diagrams you describe are the wrong image, because sets are unordered.
In most cases a colon is not a sign for a "meta-tag" as you describe there,
but more of a "namespace". This is most often used for external data
attached to imports. See for instance all the keys starting with
Jochen Topf jochen at remote.org http://www.remote.org/jochen/ +49-721-388298
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