SEAL aims to use ontologies as key elements for managing community Web sites and Web portals. The ontology supports queries to multiple sources. It also uses schema information, allowing automatic generation of navigational views (such as navigation hierarchies and mixed ontology and content-based presentation. The core idea behind SEAL is that semantic portals for a community of users contributing and consuming information require Web site management and Web information integration. To reduce engineering and maintenance effort, SEAL uses an ontology for semantic integration of existing data sources and for Web site management and presentation to the outside world. SEAL exploits this ontology to offer mechanisms for acquiring, structuring, and sharing information through semantic annotations between human and machine agents.7 Thus, SEAL combines the advantages of Web site management on the one hand and Web information integration on the other hand.