Reference for “XML Schema Part 2: Datatypes”

@TechReport{Biron:01:XSP,
  author      = "Paul V. Biron and Ashok Malhotra",
  title       = "{XML} Schema Part 2: Datatypes",
  month       = may,
  note        = "http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/",
  year        = "2001",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "first Edition of a Recommendation",
  institution = "W3C",
}