1[1]Foster I,Kesselman K. The Grid:Blueprint for a Future Computing Infrastructure. San Francisco,USA: Morgan Kaufm-ann Publishers, 1999
2[3]Uschold M, Gruninger M. Ontologies: Principles, methods and applications. The Knowledge Engineering Review, 1996,11 (2)
3[4]W3C XML Schema. http:∥www. w3. org/XML/Schema
4[5]Wooldridge M, Jennings N. Intelligent Agents: Theory and Practice, The Knowledge & Jennings, N. Intelligent Agents: Theory and Practice,The Knowledge Engineering Review, 10 (2)