4Guarino N.Formal ontology and information systems[A]. Formal Ontology in Information System[C].Trento:TOS Press,1998:6-8.
5David Eichmann.The RBSE Crawler-Balancing Effective Search Against Web Load. In Proceedings of the First International World Wide Web Conference. Geneva, Wwitzerland,1994: 113-120.
6T.Bemers-Lee, J.Hendler, and O. Lassila. The Semantic Web. Scientific American,2001,284(5):34-43.
7STUTT A, MOTTA E. Semantic learning Webs [J]. Journal of Interactive Media in Education, 2004,(10): 1-32.
8WALLER J C , FOSTER N. Training via the web. a virtual inst rurnent [J]. Computers and Education, 2000,35 (2):161-167.
9SANTOS J M, ANIDO L, LLAMAS M. Design of semantic web-based brokerage architecture for the E-learning domain . a proposal for a suitable ontology [C].Proceedings of the 35th IEEE Frontiers in Education Conference.New York . IEEE, 2005,S3H.18 - 23.
10MIZOGUCHI R ,BOURDEAU J.Using ontological engineering to overcome common AI_ED problems[J].International Journal of Artificial Intelligence in Education,2000,11 (2): 107-121.
