A Schema.org Property
An additional offer that can only be obtained in combination with the first base offer (e.g. supplements and extensions that are available for a surcharge).
Values expected to be one of these types
GoodRelations Vocabulary Terms
This term uses
terminology from the GoodRelations Vocabulary for E-Commerce, created by Martin Hepp. GoodRelations is a data model for sharing e-commerce data on the Web. More information about GoodRelations can be found at http://purl.org/goodrelations/