"includes (0..1)" . . . . . "This object property is a shortcut for the original gr:includesObject property for the common case of having exactly one single gr:ProductOrService instance included in an Offering. \n\nWhen linking to an instance of gr:SomeItems or gr:Individual, it is equivalent to using a gr:TypeAndQuantityNode with gr:hasUnitOfMeasurement=\"C62\"^^xsd:string and gr:amountOfThisGood=\"1.0\"^^xsd:float for that good.\n\nWhen linking to a gr:ProductOrServiceModel, it is equivalent to \n1. defining an blank node for a gr:SomeItems\n2. linking that blank node via gr:hasMakeAndModel to the gr:ProductOrServiceModel, and\n3. linking from the gr:Offering to that blank node using another blank node of type gr:TypeAndQuantityNode with gr:hasUnitOfMeasurement=\"C62\"^^xsd:string and gr:amountOfThisGood=\"1.0\"^^xsd:float for that good." .