Lecture Notes in Computer Science- P93:This year, we received about 170 submissions to ICWL 2008. There were a total of 52 full papers, representing an acceptance rate of about 30%, plus one invited paper accepted for inclusion in this LNCS proceedings. The authors of these accepted papers | An E-Learning System Engineering Ontology Model on the Semantic Web 449 2 Services registration Module The module stores the information of the specific services agent systems including their credit evaluation records. When the system adds some new services the information of those services should be published to the registration information database through credit evaluation service module. 3 Order Module The module addresses the implementation of orders and transmits the results to the heterogeneous systems in a unified RDF form to the Web servers. Agent System Layer Agent systems layer provides a variety of logistics services. There are a lot of differences in the data forms due to the difference of the size and type of the E-learning system collection and requirements of data. These data has still significant difference whether in the description or in storage therefore information center and converter should be constructed for various services agency. E-learning system converter can convert the services submitted by the services parser into a variety of operations for different services and hand them for the order actuator to implement their services by accessing the data dictionary in the information center. Similarly when a new agency joins the E-learning system its service information should be transformed and stored in the information center. At the same time its integrity and the basic conditions will be stored in the registration information database to be accessed by users online. 3 Ontology and E-Learning System Ontology Ontology is the study of existence of all kinds of entities abstract and concrete that make up the world. Ontology defines the kinds of things that exist in the application domain. Without ontology the terms and symbols of a domain will be ill-defined and confusing 10 11 . Ontology therefore is a content theory about the sorts of objects properties of objects and relations between objects in a specified domain 12 . It is a .
