Reference for “Element Traversal Specification”

@TechReport{Schepers:08:ETS,
  author      = "Doug Schepers and Robin Berjon",
  title       = "Element Traversal Specification",
  month       = dec,
  note        = "http://www.w3.org/TR/2008/REC-ElementTraversal-20081222/",
  year        = "2008",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Recommendation",
  institution = "W3C",
}