1. T. Bray, J. Paoli, C. M. Sperberg-McQueen, E. Maler (Eds.), Extensible Markup Language (XML) 1.0, 2000, http://www.w3.org/TR/REC-xml.
2. J. Clark, S. DeRose (Eds.), XML Path Language (XPath), Version 1.0, 1999, http://www.w3.org/TR/xpath.
3. J. Clark (Ed.), XSL Transformations (XSLT), Version 1.1, 2000, http://www.w3.org/TR/xslt11.
4. R. Goldman, J. McHugh, J. Widom, From semistructured data to XML: migrating the Lore data model and query language, in: second ACM SIGMOD International Workshop on The Web and Databases, Philadelphia, PA, 1999, pp. 25–30.
5. P. Buneman, S. Davidson, G. Hillebrand, D. Suciu, A query language and optimization techniques for unstructured data, in: ACM SIGMOD Conference on Management of Data, Montreal, Canada, 1996, pp. 505–516.