<status value="draft" /> <fhirVersion value="4.0.0" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="Condition" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension"> <path value="Extension" /> <mustSupport value="false" /> <isModifier value="false" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <type> <code value="dateTime" /> </type> <type> <code value="Age" /> </type> <type> <code value="Period" /> </type> <type> <code value="Range" /> </type> <type> <code value="string" /> </type> <type> <code value="Coding" /> </type> </element> <element id="Extension.value[x]:valueCoding"> <path value="Extension.value[x]" /> <sliceName value="valueCoding" /> <type> <code value="Coding" /> </type> <binding> <strength value="preferred" /> <valueSet value="http://ga4gh.org/fhir/phenopackets/ValueSet/onset" /> </binding> </element> </differential> </StructureDefinition>