1. Data on the Web: From Relations to Semistructured Data and XML;Abiteboul,1999
2. Oracle8i – The XML enabled data management system;Banerjee,2000
3. Conceptual Database Design: An Entity-Relationship Approach;Batini,1992
4. A vision of management of complex models;Bernstein;ACM SIGMOD Record,2000
5. P.V. Biron, A. Malhotra (Eds.), XML Schema Part 2: Datatypes, W3C Recommendation, http://www.w3.org/TR/xmlschema-2/, May 2001