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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Q. What is a limitation of using ontology development tools like Protégé for query formulation?

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Q. What is the purpose of a "query by navigation" interface in ontology-based systems?

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

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Q. How does the navigational approach in query by navigation differ from traditional keyword-based approaches?

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Q. What is a potential application of query by navigation in the Semantic Web domain?

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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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