On 3 January 2013 14:43, Pieren <pier...@gmail.com> wrote: > On Thu, Jan 3, 2013 at 2:59 PM, Andy Allan <gravityst...@gmail.com> wrote: > > > "Don't deliberately enter data incorrectly for the renderer" > > We should add : "Don't accept tag changes until the renderer supports it". > > Pieren > > The reason that OSM doesn't do depreciation is that there is no such thing as "the renderer". You don't know if I have a private(or lesser known) render that relies on a used tag. And it's not limited to renderers, but editors, data sources, and non-visual uses/applications (such as driving directors).
Introducing new tags should also take this into account. For example we had railway=rail and railway=tram type tags. I might make a map that displays railway=* as a grey line (because I'm more interested in some other detail but I want tracks for context). For a short time railway=historic got into popular use. My map would then start showing railways where they weren't! A better choice for the new tag is historic=railway because nobody is going to render that as an existing railway by mistake. Slowly people can start recognising the historic tag if they wish to. I can't remember the exact tags in the true version of this story, I think it was actually to do with stations. -- Gregory o...@livingwithdragons.com http://www.livingwithdragons.com
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