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Query answering for the QL profile of OWL 2 and a substantial fragment of the EL profile can be implemented via query rewriting. In our previous work, we presented RQR-a rewriting algorithm for OWL QL that can also deal with most of the EL profile. In order to test the likely practicality of RQR, we have implemented it in a query rewriting system that we call REQUIEM. A recent empirical evaluation of RE-QUIEM, in which we considered OWL 2 QL ontologies, indicates that it produces significantlydblp:conf/semweb/Perez-UrbinaHM08 fatcat:d7jfwmbagvfbhnj7e5pwsygzyu