Representing knowledge in the semantic Web

The Web is an immense repository of data and knowledge. Semantic web technologies support semantic interoperability and machine-to-machine interaction. A significant role is played by ontologies, which can support reasoning. Generally much emphasis is given to retrieval, while users tend to browse by association. If data are semantically annotated, an appropriate intelligent user agent aware of the mental model and interests of the user can support her/him in finding the desired information. The whole process must be supported by a core ontology.