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essin (18) [Avatar] Offline
#1
Microformats
Microformats are an effort to extend the expressive power of standard HTML by
using certain attributes, mostly the class attribute, in a standardized way. Popular
microformats include hCard, for describing contact information, adr for addresses,
and hCalendar for describing events. Similar technologies include the
more formal RDFa and HTML5’s own microdata (see section 2.5.3).

There isn't anything labeled 2.5.3

In fact, there don't appear to be any section numbers at all.