<p><a href="http://www.openstreetmap.org/welcome">http://www.openstreetmap.org/welcome</a> mentions the OSM basics : editor, node, way, and tag. One important requirement for this page is that it should be as short as possible, which probably explains why relations are not mentioned.</p>
<p>I'm now thinking that this is a mistake. Relation are one of the four building blocks of the OSM data model. It's becoming more unlikely every day that a user could edit the map without encountering relations. Because relations are not mentioned on the welcome page and are rather discreet in most editors, a newbie's first interaction with a relation will probably be to break it. And a lot of contributors prefer to avoid relations whenever possible, even if the workaround is akward.</p>
<p>This is all detrimental to OSM, so I suggest adding a one-line description like we have for the other elements. Something like "A relation groups nodes and ways together to define areas, bus routes, or turn restrictions".</p>
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