By
http://www.w3.org/2000/01/rdf-schema#isDefinedBy
is a Property

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Property Object
Type Property
By http://www.w3.org/2000/01/rdf-schema#
See also http://www.w3.org/2000/01/rdf-schema#

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Subject Property
Property partition: http://www.w3.org/2000/01/rdf-schema#isDefinedBy property