http://hl7.org/fhir/StructureDefinition/11179-objectClassProperty|5.2.0

A quality common to all members of an object class. A property may be any feature that humans naturally use to distinguish one individual object from another. It is the human perception of a single quality of an object class in the real world. It is conceptual and thus has no particular associated means of representation by which the property can be communicated.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/Coding
Extension.value[x].binding.valueSethttp://hl7.org/fhir/ValueSet/dataelement-sdcobjectclassproperty