Reference for “Requirements for XML Schema 1.1”

@TechReport{Malhotra:03:RXS,
  author      = "Ashok Malhotra and Charles Campbell and Priscilla Walmsley",
  title       = "Requirements for {XML} Schema {1.1}",
  month       = jan,
  note        = "http://www.w3.org/TR/2003/WD-xmlschema-11-req-20030121/",
  year        = "2003",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}