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variesBy

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > variesBy

Indicates the property or properties by which the variants in a ProductGroup vary, e.g. their size, color etc. Schema.org properties can be referenced by their short name e.g. "color"; terms defined elsewhere can be referenced with their URIs.
Values expected to be one of these types
DefinedTerm
Text
Used on these types
ProductGroup

Source

https://github.com/schemaorg/schemaorg/issues/1797