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<p>Try to understand that there is a serious point being made here.</p>
<p>Multi-valued keys always cause arguments on these lists. Unfortunately the forces of nature have decided that some shops fit in multiple categories at the same time, and some roads have multiple ref's and there are plenty of other examples where mappers have felt that the k=v1;v2 model best fits their perception of reality. The strongest voices seem to prefer avoiding this construction. There are occasional discussions about how to do it better, but it always fizzles out to nothing.</p>
<p>In the big metamodel, we have 0-dimensional information, whereby the mere existence of the key is enough; we have 1-dimensional information, where a key has a single value (such as is represented in OSM with highway=*), we have 2-dimensional information, where the value is a list of atomic values, like what a shop sells. We could also look at more complex information, where the value is a list of data items of varying types. This often gets mapped to the so-called namespace syntax with a colon separating the main key from the individual information component, so we can distinguish between the "name" of different classes of object and interpret them differently if we require.</p>
<p>OSM provides only a metamodel with nodes, ways, and relations, all of which can have key-value pairs. That's it, apart from changesets and versions. Anything at a higher semantic level needs to come from the community. All these primeval objects are rattling around in space waiting for the earth to form after the big bang. </p>
<p>Time to work towards an updated metamodel, with:</p>
<p>* Multiple values (lists of values - sorting out the semicolon business?)</p>
<p>* Complex values (data structures - formalising the namespace syntax?)</p>
<p>* Simple Polygon as a basic type ("under construction" without any tangible progress for years)</p>
<p>These are all real-life things that cause a lot of energy to be expended in OSM, simply because we don't have a way of representing them in the metamodel.</p>
<p>Time to take things to the next level!</p>
<p>//colin</p>
<p>On 2015-06-06 04:09, Andreas Goss wrote:</p>
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<div class="pre" style="margin: 0; padding: 0; font-family: monospace"><span style="white-space: nowrap;">On 6/6/15 02:51 , pmailkeey . wrote:</span><br /><br />
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0"><span style="white-space: nowrap;">shop=photon - where n is a number on a scale to indicate the range of</span><br /><span style="white-space: nowrap;">products e.g. :</span><br /><br /><span style="white-space: nowrap;">photo1 - basic point n shoot cameras</span><br /><br /><span style="white-space: nowrap;">photo5 - cameras, lenses, film, printing/developing service,</span><br /><span style="white-space: nowrap;">knowledgeable advice</span><br /><br /><span style="white-space: nowrap;">photo9 - would include dark-room equipment, enlargers, range of</span><br /><span style="white-space: nowrap;">photo-quality digital printers (to buy) digital photo suite - inc.</span><br /><span style="white-space: nowrap;">computer and also illegal batteries for obsolete cameras !</span></blockquote>
<br /><br /> Honestly I don't even know what to say about 99% of your tagging suggestions...<br /><br /><br /> __________<br /><span style="white-space: nowrap;">openstreetmap.org/user/AndiG88</span><br /><span style="white-space: nowrap;">wiki.openstreetmap.org/wiki/User:AndiG88</span><br /><br /><br /> _______________________________________________<br /><span style="white-space: nowrap;">Tagging mailing list</span><br /><span style="white-space: nowrap;"><a href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a></span><br /><span style="white-space: nowrap;"><a href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a></span></div>
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