<status value="draft" /> <date value="2022-01-01T04:37:11.5573828+00:00" /> <description value="Capture the patient’s blood type." /> <purpose value="This extension developed for the training course." /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="Patient" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension"> <path value="Extension" /> <max value="1" /> </element> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="http://example.org/fhir/StructureDefinition/patient-bloodType" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <min value="1" /> <type> <code value="Coding" /> </type> <binding> <strength value="preferred" /> <valueSet value="http://example.org/fhir/ValueSet/ABO-blood" /> </binding> </element> <element id="Extension.value[x].system"> <path value="Extension.value[x].system" /> <min value="1" /> </element> <element id="Extension.value[x].version"> <path value="Extension.value[x].version" /> <max value="0" /> </element> <element id="Extension.value[x].code"> <path value="Extension.value[x].code" /> <min value="1" /> </element> <element id="Extension.value[x].userSelected"> <path value="Extension.value[x].userSelected" /> <max value="0" /> </element> </differential> </StructureDefinition>