The Wisdom of Crowds Meets the Wisdom of Authors: How XML Enables the Semantic Web
http://www.thecontentwrangler.com/article/the_wisdom_of_crowds_meets_the_wisdom_of_authors_how_xml_enables_the_semant/

Wlodarczyk, Paul
Content Wrangler, The
2008

Abstract:

Key to the Semantic Web is semantic markup, which lets users annotate their web pages with metadata -- HTML attributes that don't get displayed in the document. Semantic metadata describes what the pages are about, letting authors define things with authority and precision.