Q. What is a key challenge of diagrammatic approaches and textual data browsers in the context of complex ontologies?

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Q. Why is it challenging for end-users, even those knowledgeable in their domain, to access data in some cases?

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Q. What is a necessary feature of a query formulation tool to help users understand complex ontologies?

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Q. What challenge arises when users want to list all digital cameras with ≥12 MP resolution based on complex ontologies?

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Q. In the context of complex queries, what is the importance of providing a textual query interface for technically versed users?

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Q. Why is it important to support "on the fly" extension of the ontology during query formulation?

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Q. How can users relate new vocabulary to existing ontology terms when extending the ontology during query formulation?

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Q. How can users relate new vocabulary to existing ontology terms when extending the ontology during query formulation?What kind of query interface views should ideally be provided to users dealing with complex queries?

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Q. What is the purpose of the ontology in the OBDA architecture?

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Q. Why is developing ontologies from scratch considered expensive in OBDA?

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Q. How can ontologies evolve in OBDA systems?

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Q. What is one of the challenges in managing large, evolving sets of mappings in OBDA?

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Q. What do ontology management tools like Protégé and NeOn primarily support?

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Q. What is the goal of comparing schema mapping languages in research?

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Q. What is one of the main aspects considered when comparing schema mappings in research?

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Q. What is one of the challenges in mapping management within the realm of OBDA?

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Q. Why might mappings in OBDA systems become obsolete?

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Q. What is the goal of mapping simplification in the context of OBDA?

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Q. How can the problem of accommodating new vocabulary or knowledge from new data sources be addressed in OBDA?

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Q. What is the goal of defining a specific language for querying schema mappings?

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