What is the difference between OBQA ontology-based query answering and OBDA ontology-based data access?

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i have a relational database and i want to access it using sparql,i want to build a system not to use the existing ones.
so i read about Ontology based Data Access then i read about Ontology Based Query Answering,but i didn't know the difference between them,and i want to know the difference between them according to relational database access using sparql.

What I have tried:

I have searched but no interesting result were found

Posted 13-Sep-17 20:32pm

Rawan Abo Zidan

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