Carcharoth wrote:
Tags and categories are different. Ideally, you would have both, or a clear of idea of what would be "primary" tags (what we call categories) and what are descriptive tags.
I asked about flickr tags years ago, but never understood the replies I got, see:
http://lists.wikimedia.org/pipermail/wikitech-l/2006-January/021346.html http://lists.wikimedia.org/pipermail/wikitech-l/2006-January/021348.html http://lists.wikimedia.org/pipermail/wikitech-l/2006-January/021352.html http://lists.wikimedia.org/pipermail/wikitech-l/2006-January/021374.html http://lists.wikimedia.org/pipermail/wikitech-l/2006-January/021350.html
Sam Wantman and Rick Block came up with [[Wikipedia:Category intersection]], which might be of interest.