Distributed and replicated systems, such as Big Data applications, deal with conflicting and duplicated data. Therefore, it is needed a database with flexible data model to materialize the data and an end-user oriented interface in order to allow queries in heterogeneous data. Using OBDA approach in a Graph Database is an attempt to solve these problems. However, new problems arise regarding hierarchical navigation using Graph Database query language. This work proposes a solution in which an ontology's reasoner is used to retrieve the subclasses of the original queried concepts. These retrieved concepts are used to rewrite the submitted query.
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