PREFIX dct: PREFIX dc: PREFIX dbr: PREFIX dbo: PREFIX xsd: PREFIX bb: PREFIX vann: PREFIX meta: PREFIX rdf: PREFIX owl: PREFIX yago: PREFIX org: PREFIX ciox: PREFIX purl: PREFIX foaf: PREFIX rdfs: PREFIX it4it: PREFIX it: PREFIX skos: PREFIX schema: PREFIX dbp: PREFIX ob: PREFIX he: PREFIX ov: PREFIX sh: PREFIX sniko: bb:ObjectClass a meta:EntityType; bb:page "55"^^xsd:positiveInteger; meta:chapter bb:chapter5-3; rdfs:label "Object Class"@en, "کلاس شی"@fa; rdfs:subClassOf bb:ResearchAndEducationEntityType; skos:definition "Objects being similar with respect to their attribute categories are summarized as object classes"@en.