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We present a demo of ESTER, a search engine that combines the ease of use, speed and scalability of full-text search with the powerful semantic capabilities of ontologies. ESTER supports full-text queries, ontological queries and combinations of these, yet its interface is as easy as can be: A standard search field with semantic information provided interactively as one types. ESTER works by reducing all queries to two basic operations: prefix search and join, which can be implemented verydoi:10.1109/icdmw.2008.101 dblp:conf/icdm/BastSW08 fatcat:pkjbzwi3evdvhlyu4wqn5q3wgq