Let??™s look at a couple of examples. Assume we have a collection of bookmarks in
Del.icio.us. Two hundred of those are tagged with ???webdesign,??? 200 are tagged with
???css,??? and 200 are tagged with ???ajax.??? Some of the ???css??? bookmarks are tagged with
???webdesign??? and ???ajax,??? some of the ???ajax??? bookmarks tagged with ???webdesign,??? and
???css,??? and so forth (see Figure 4 .12).
css ajax
webdesign
Figure 4.12 Bookmarks tagged with
???css,??? ???webdesign,??? and ???ajax.???
What can we say about the semantic relationship between these three tags? We can
guess, based on how much they overlap, that they are related in some way. If you
were familiar with ???webdesign??? and you??™d never heard of ???ajax,??? you might guess correctly
that ???ajax??? is a new technology or tool related to ???webdesign.???
If you work on the Web, you already have an intuitive sense of how these three terms
are related. But consider a slightly different example, taken from the social bookmarking
site Connotea.
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