<http://schema.org/addOn>	<http://schema.org/contributor>	<http://schema.org/docs/collab/GoodRelationsTerms> .
<http://schema.org/addOn>	<http://www.w3.org/2000/01/rdf-schema#comment>	"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)." .
<http://schema.org/addOn>	<http://schema.org/rangeIncludes>	<http://schema.org/Offer> .
<http://schema.org/addOn>	<http://www.w3.org/2000/01/rdf-schema#label>	"addOn" .
<http://schema.org/addOn>	<http://schema.org/domainIncludes>	<http://schema.org/Offer> .
<http://schema.org/addOn>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#Property> .