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Make subClass property optional
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@@ -137,7 +137,7 @@ Based on RDFS classes, these can be used as object and subjects of triples.
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| @id | MUST | ID of the entry |
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| @type | MUST | Is `rdfs:Class` |
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| owl:equivalentClass | MAY | Ontological annotation https://www.w3.org/TR/owl-ref/#equivalentClass-def |
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| rdfs:subClassOf | MUST | Used to indicate inheritance. Each entry has to inherit from something, this can be a base type. https://www.w3.org/TR/rdf-schema/#ch_subclassof |
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| rdfs:subClassOf | MAY | Used to indicate inheritance. Each entry has to inherit from something, this can be a base type. https://www.w3.org/TR/rdf-schema/#ch_subclassof |
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| rdfs:label | MAY | Label of the class |
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| rdfs:comment | MAY | Human-readable description of this class |
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| owl:restriction | MAY | OWL restriction, a list of OWL restrictions, see [OWl Restriction](#owl-restriction) |
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