Sponging :  disallowed (Read-only view)
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http://purl.org/goodrelations/v1#isVariantOf

This states that a particular Product Or Service Model instance is a variant of another Product Or Service Model. It is pretty safe to infer that the variant inherits all quantitativeProductOrServiceProperties, qualitativeProductOrServiceProperties, and datatypeProductOrServiceProperties that are defined for the first Product Or Service Model. Example: foo:Red_Ford_T_Model gr:isVariantOf foo:Ford_T_Model