Reference for “Widgets 1.0: Digital Signature”

@TechReport{Caceres:08:WDS,
  author      = "Marcos Caceres",
  title       = "Widgets 1.0: Digital Signature",
  month       = apr,
  note        = "http://www.w3.org/TR/2008/WD-widgets-digsig-20080414/",
  year        = "2008",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}