1. P.A. Bernstein, F. Giunchiglia, A. Kementsietsidis, J.M., L. Serafini, I. Zaihrayeu, Data management for peer-to-peer computing: a vision, in: Proceedings of the Fifth International Workshop on the Web and Databases, Madison, WI, June 2002, pp. 89–94.
2. H.S. Thompson, D. Beech, M. Maloney, N. Mendel-Sohn (Eds.), XML Schema Part 1: Structures. W3C Document, April 2000.
3. M. Makoto, RELAX (REgular LAnguage Description for XML). Internet Document, April 2000, 〈http://www.xml.gr.jp/relax/〉.
4. A. Davidson, M. Fuchs, M. Hedin, M. Jain, J. Koistinen, C. Lloyd, M. Maloney, K. Schwarzhof, Schema for object-oriented XML 2.0, W3C Document, July 1999.
5. A vision for management of complex models;Bernstein;SIGMOD Record,2000