Reference for “Internationalization Best Practices: Specifying Language in XHTML & HTML Content”

@TechReport{Ishida:07:IBP,
  author      = "Richard Ishida",
  title       = "Internationalization Best Practices: Specifying Language in {XHTML} \& {HTML} Content",
  month       = apr,
  note        = "http://www.w3.org/TR/2007/NOTE-i18n-html-tech-lang-20070412/",
  year        = "2007",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Note",
  institution = "W3C",
}