Community web sites exhibit two dominating properties: They often need to integrate many different information sources and they require an adequate web site management system. SEAL (SEmantic portAL) is a conceptual model that exploits ontologies for fulfilling the requirements set forth by these two properties at once. The ontology provides a high level of sophistication for web information integration as well as for web site management. We describe the SEAL conceptual architecture as well as its current implementation in KAON.