This code system http://hl7.org/fhir/concept-property-type defines the following codes:

CodeDisplayDefinition
codecode (internal reference)The property value is a code that identifies a concept defined in the code system
CodingCoding (external reference)The property value is a code defined in an external code system. This may be used for translations, but is not the intent
stringstringThe property value is a string
integerintegerThe property value is a string (often used to assign ranking values to concepts for supporting score assessments)
booleanbooleanThe property value is a boolean true | false
dateTimedateTimeThe property is a date or a date + time

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