7 CONTACT INFORMATIONMICROFORMAT: HCARD

Above all else, and despite the wishes of traditional media companies, the Web is a medium for two-way communication. Technology sites like Slashdot and Digg, and political sites like Daily Kos are as much about the discussion as they are about the articles. Rare is the site that does not prominently feature a Contact link on its home page. And with blogging in particular, the two-way conversation of trackbacks and comments are essential to the medium.

But precisely how these almost ubiquitous contact details are marked up from site to site varies dramatically. This makes a seemingly simple task like building a white pages–style directory from freely published information on the Web a daunting challenge, ...

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