Knowledge portals provide views onto domain-specific information on the World Wide Web, thus facilitating their users to find relevant, domain-specific information. The construction of intelligent access and the provisioning of information to knowledge portals, however, remained an ad hoc task requiring extensive manual editing and maintenance by the knowledge portal providers. In order to diminish these efforts we use ontologies as a conceptual backbone for providing, accessing and structuring information in a comprehensive approach for building and maintaining knowledge portals. We present one research and one commercial case study that show how our approach is used in practice. Keywords: Ontology, Knowledge Sharing, WWW 1 Introduction "Content is king" is the traditional credo of media companies in the Web. Now that the promises of the World Wide Web in its first stage have been delivered, information pointing to other information is ubiquitous and everyone laments under t...
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