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The common user interface for a search engine consists of a text field where the user can enter queries consisting of one or more keywords. Keyword query based search engines work well when the users have a clear vision what they are looking for and are capable of articulating their query using the same terms as indexed. For our multimedia database containing 202,868 items with text descriptions, we supplement such a search engine with a category-based interface whose category structure isdoi:10.1155/2014/454868 pmid:24616630 pmcid:PMC3925568 fatcat:l4orpgkd55fdlcaxcp4pnmept4