Source: Schema.org v30.1 vocabulary. Official variesBy property definition.
What does variesBy mean?
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. Variant properties can be provided using [[PropertyValue]] instead of plain [[Text]], to allow specification of the values available for a variant property.
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status