Schema.org Vocabulary › Property: valueReference
https://schema.org/valueReference
A secondary value that provides additional information on the original value, e.g. a reference temperature or a type of measurement.
Domain: QualitativeValue, PropertyValue, QuantitativeValue
Range: StructuredValue, Text, QualitativeValue, PropertyValue, MeasurementTypeEnumeration, QuantitativeValue, DefinedTerm, Enumeration