1. Yergeau, F., Bray, T., Paoli, J., Sperberg-McQueen, C.M., and Maler, E., Extensible Markup Language. W3C Recommendation. 4th February 2004. http://www.w3.org/TR/2004/REC-xml-20040204 .
2. Boag, S., Chamberlin, D., Fernandez, M., Florescu, D., Robie, J., and Simeon, J., Xquery 1.0: An XML Query Language. W3C Working Draft. 11 February 2005. http://www.w3.org/TR/xquery/ .
3. Technical Report;A. Schmidt,2001
4. Gray, J. and Renter, A., Transaction Processing: Concepts and Techniques, San Francisco: Morgan Kaufmann, 1993.
5. Weikum, G., Principles and Realization Strategies of Multilevel Transaction Management, ACM Trans. Database Systems, 1991, vol. 16, no. 1, pp. 132–180.