Reference for “RDFa Primer”

@TechReport{Birbeck:08:RP,
  author      = "Mark Birbeck and Ben Adida",
  title       = "{RDFa} Primer",
  month       = oct,
  note        = "http://www.w3.org/TR/2008/NOTE-xhtml-rdfa-primer-20081014/",
  year        = "2008",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Note",
  institution = "W3C",
}