1. Babcock, B., Babu, S., Datar, M., Motwani, R., Widom, J.: Models and Issues in Data Stream Systems. In: PODS 2002 (2002)
2. Berglund, A., Boag, S., Chamberlin, D., Fernandez, M.F., Kay, M., Robie, J., Simon, J.: XML path language (XPath) 2.0. W3C working draft 16. Technical Report WD-xpath20-20020816. World Wide Web Consortium (2002)
3. Bertino, E., Castano, S., Ferrari, E., Mesiti, M.: Specifying and Enforcing Access Control Policies for XML Document Sources. WWW Journal (2000)
4. Bertino, E., Ferrari, E.: Secure and Selective Dissemination of XML Documents. TISSEC 5(3) (2002)
5. Boag, S., Chamberlin, D., Fernandez, M.F., Florescu, D., Robie, J., Simon, J.: XQuery 1.0: An XML Query Language. W3C working draft 16. Technical Report WD-xquery-20020816. World Wide Web Consortium (2002)