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Today, Web pages are usually accessed using text search engines, whereas documents stored in the deep Web are accessed through domain-specific Web portals. These portals rely on external knowledge bases, respectively ontologies, mapping documents to more general concepts allowing for suitable classifications and navigational browsing. Since automatically generated ontologies are still not satisfactory for advanced information retrieval tasks, most portals heavily rely on hand-crafteddoi:10.1145/1871437.1871735 dblp:conf/cikm/KohnckeB10 fatcat:tidhqgl2zzb37nqgoqeyhdzuv4