الفهرس 
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Abstract
Ontology-Based Data Access (OBDA) enables semantic access to a set of heterogamous data sources, supporting data sharing, exchanging, and integration across these data sources. In the OBDA scheme, normally formal query languages, such as SPARQL, are used to present the user questions, which limits end users from defining their requests. To cope with this problems a layer that accepts the users request in her own language and transforms it into one of these formal languages has become a necessity. To this end, we introduce a new and interactive method that guides the users during the translation. The proposed approach makes use of the capabilities of natural language processing and semantic information embedded in the domain ontology.