In this article written by Frederick Townes for isedb.com, the emphasis is in semantics and how to make websites machine readable. Semantics allow search engines to scroll and index content with an accurated specificity.

Semantics are established by rules or conventions. As languages, Internet uses its onw semantics’ rules. Using proper semantics, SEs are able to identify relationships between various chunks of site text, and from a site skin POV, semantics better equip visitors to more easily identify these relationships, whether via browser or as human eyeballs reading the screen.

That is why for designers is important to be W3C-oriented. “Semantics should be viewed as a set of guidelines to help programmers, designers, software developers and others to use the W3C-compliant tools and protocols properly. Indeed, because the task of connecting web users to specific information is shifting from search engines to site developers, all that remains is for semantics tools to be used properly” Frederick Townes says.

You can read more about more about this article at isedb.com