Q. What is one of the challenges related to ontology and mappings in OBDA?

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Q. How can an initial ontology and mappings be derived in new deployments of OBDA systems?

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Q. What is the role of the Ontology and Mapping Management component in the architecture?

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Q. Why is there a trade-off between expressivity and efficiency in ontology and mapping languages?

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Q. How can the expressivity problem in ontology and mapping languages be resolved for specific applications?

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Q. What are vital features that need to be built into the core of any OBDA system?

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Q. Which domain often requires integration into the OBDA framework due to its relevance in many applications?

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Q. What is one of the ways to address efficiency in OBDA systems?

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Q. Which layer in the proposed query answering stack focuses on distributing queries to individual servers?

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Q. What is the key to gaining a real impact on efficiency in OBDA systems?

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Q. What is one of the key challenges in traditional database query languages like SQL?

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Q. Which approach in database systems employs recognition and direct manipulation objects to provide easy and intuitive user interaction?

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Q. What is the primary concern of usability in software systems, including database systems?

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Q. What is a key factor for the success of a system from a usability perspective?

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Q. What paradigm is considered crucial for capturing and communicating domain knowledge to end-users in database systems?

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Q. What is a key feature of any Ontology-Based Data Access (OBDA) system regarding the ontology?

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Q. Why is it unrealistic to expect all domain experts to formulate queries directly in a complex query language?

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Q. What is faceted search in the context of ontology-based systems?

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Q. How does faceted search benefit users in information retrieval?

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Q. When does faceted search encounter limitations in information retrieval?

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