Practice English vocabulary for RDF, triples, URIs, RDFS, OWL ontologies, and Turtle syntax used in semantic web and knowledge graph work.
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What is an RDF triple?
An RDF triple is the fundamental data unit: subject–predicate–object. For example: . Every fact in an RDF graph is expressed as one or more triples.
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What is a URI/IRI used for in RDF?
URIs (Uniform Resource Identifiers) and IRIs (Internationalized Resource Identifiers) provide globally unique names for resources in RDF. This allows data from different sources to be merged unambiguously.
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What does OWL add on top of RDF Schema (RDFS)?
RDFS provides basic class hierarchies (subClassOf) and property ranges/domains. OWL extends this with description logic axioms enabling automated reasoning — inferring new facts and checking ontology consistency.
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Which sentence correctly uses 'subClassOf' in an ontology context?
rdfs:subClassOf declares a subsumption relationship: if X subClassOf Y, every X is also a Y. A reasoner can then infer that an individual typed as Mammal is also an Animal, without that triple being explicitly asserted.
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In Turtle syntax, what does the prefix declaration '@prefix ex: .' achieve?
Turtle prefix declarations create compact namespace abbreviations. @prefix schema: . lets you write schema:Person instead of the full URI, making Turtle files much more readable.