1. Bray, T., Paoli, J., Sperberg-McQueen, C.M., Maler, E., Yergeau, F.: Extensible Markup Language (XML) 1.0. W3C Recommendation, 10th edn. (2008), http://www.w3.org/TR/REC-xml/
2. Clark, J., DeRose, S.: XML Path Language (XPath) Version 1.0 (1999), http://www.w3.org/TR/xpath/
3. Boag, S., Chamberlin, D., Fernández, M.F., Florescu, D., Robie, J., Siméon, J.: XQuery 1.0: An XML Query Language (2007), http://www.w3.org/TR/xquery/
4. Li, Q., Moon, B.: Indexing and Querying XML Data for Regular Path Expressions. In: Proceedings of the 27th International Conference on Very Large Data Bases, pp. 361–370. Morgan Kaufmann, Roma (2001)
5. Zhang, C., Naughton, J., DeWitt, D., Luo, Q., Lohman, G.: On Supporting Containment Queries in Relational Database Management Systems. ACM SIGMOD Record Journal 30(2), 425–436 (2001)