Reference for “Unicode in XML and other Markup Languages”

@TechReport{Freytag:07:UXM,
  author      = "Asmus Freytag and Martin D{\"{u}}rst",
  title       = "Unicode in {XML} and other Markup Languages",
  month       = may,
  note        = "http://www.w3.org/TR/2007/NOTE-unicode-xml-20070516/",
  year        = "2007",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Note",
  institution = "W3C",
}