http://hl7.org/fhir/StructureDefinition/Quantity|4.0.1

Base StructureDefinition for Quantity Type: A measured amount (or an amount that can potentially be measured). Note that measured amounts include amounts that are not precisely quantified, including amounts involving arbitrary units and floating currencies.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Element
typehttp://hl7.org/fhir/StructureDefinition/Quantity
Quantity.value.typehttp://hl7.org/fhir/StructureDefinition/decimal
Quantity.comparator.typehttp://hl7.org/fhir/StructureDefinition/code
Quantity.comparator.binding.valueSethttp://hl7.org/fhir/ValueSet/quantity-comparator | 4.0.1
Quantity.unit.typehttp://hl7.org/fhir/StructureDefinition/string
Quantity.system.typehttp://hl7.org/fhir/StructureDefinition/uri
Quantity.code.typehttp://hl7.org/fhir/StructureDefinition/code