A post from 2006? Anyway, a long time ago Delicious quietly implemented experimental support of structured tags delimited by colons. You can tag things "foo:bar

A post from 2006? Anyway, a long time ago Delicious quietly implemented experimental support of structured tags delimited by colons. You can tag things "foo:bar" and "foo:baz" and then see all of those bookmarks by looking at "system:has:foo". An example: http://www.delicious.com/britta/system:has:via http://www.delicious.com/britta/system:has:via Flickr uses colons too and calls these structured tags "machine tags": http://www.flickr.com/groups/api/discuss/72157594497877875/ http://www.flickr.com/groups/api/discuss/72157594497877875/ - if you're interested in that kind of thing, Aaron Straup Cope is the person to read more from: http://www.aaronland.info/weblog/ http://www.aaronland.info/weblog/