1. James Clark, Steve DeRose. XML path language (XPath), version 1.0. W3C Recommendation, http://www.w3.org/TR/xpath .
2. Scott Boag, Don Chamberlin et al. XQuery 1.0: An XML query language. W3C Candidate Recommendation. http://www.w3.org/TR/xquery .
3. Steven DeRose, Eve Maler et al. XML linking language (XLink), version 1.0. W3C Recommendation, http://www.w3.org/TR/xlink .
4. Steven DeRose, Ron Daniel Jr. et al. XML pointer language (XPointer). W3C Working draft, http://www. w3.org/TR/xptr .
5. James Clark. XSL transformations (XSLT), version 1.0. W3C Recommendation, http://www.w3.org/TR/xslt .