http://hl7.org/fhir/StructureDefinition/maxSize|5.2.0

For attachment answers, indicates the maximum size in bytes an attachment can be.

element_id	types
Extension
Extension.extension
Extension.url
Extension.value[x]	decimal
Extension
Extension.id	http://hl7.org/fhirpath/System.String
Extension.extension	Extension
Extension.url	http://hl7.org/fhirpath/System.String
Extension.value[x]	decimal