Reference for “XML Path Language (XPath) Version 1.0”

@TechReport{Clark:99:XPL,
  author      = "James Clark and Steven DeRose",
  title       = "{XML} Path Language ({XPath}) Version 1.0",
  month       = nov,
  note        = "http://www.w3.org/TR/1999/REC-xpath-19991116",
  year        = "1999",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Recommendation",
  institution = "W3C",
}