<status value="active" /> <experimental value="false" /> <date value="2025-09-08" /> <publisher value="Robert Koch-Institut" /> <description value="If the value is not a proper value, indicates the reason." /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="Element" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension"> <path value="Extension" /> <short value="Null flavor" /> <definition value="If the value is not a proper value, indicates the reason." /> </element> <element id="Extension.extension"> <path value="Extension.extension" /> <max value="0" /> </element> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="https://emiga.rki.de/fhir/common/Extension/NullFlavor" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <short value="Nicht ermittelbar oder nicht erhoben" /> <definition value="Gibt an, warum kein richtiger Wert vorhanden ist." /> <min value="1" /> <type> <code value="Coding" /> </type> <mustSupport value="true" /> <binding> <strength value="required" /> <valueSet value="https://emiga.rki.de/fhir/ValueSet/NullFlavor" /> </binding> </element> <element id="Extension.value[x].system"> <path value="Extension.value[x].system" /> <min value="1" /> <patternUri value="http://terminology.hl7.org/CodeSystem/v3-NullFlavor" /> <mustSupport value="true" /> </element> <element id="Extension.value[x].version"> <path value="Extension.value[x].version" /> <mustSupport value="true" /> </element> <element id="Extension.value[x].code"> <path value="Extension.value[x].code" /> <min value="1" /> <mustSupport value="true" /> </element> <element id="Extension.value[x].display"> <path value="Extension.value[x].display" /> <mustSupport value="true" /> </element> </differential> </StructureDefinition>