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With the World Wide Web popularity the information retrieval area has a new challenge intending to retrieve information resources by their meaning by using a knowledge base. Nowadays ontologies are being used to model knowledge bases. To deal with knowledge subjectivity and uncertainty fuzzy set theory techniques are employed. Preceding works encode a knowledge base using just one ontology. But a document collection can deal with different domain themes, expressed by distinct ontologies. Indoi:10.1109/ictai.2008.72 dblp:conf/ictai/LeiteR08 fatcat:rjg4pqazqng7lo2qdpjmtxmcza