<status value="active" /> <date value="2021-05-01" /> <description value="Describes regularity of use." /> <fhirVersion value="4.0.0" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="MedicationStatement.dosage" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="http://ehelse.no/fhir/StructureDefinition/sfm-use" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <type> <code value="CodeableConcept" /> </type> </element> <element id="Extension.value[x].coding.system"> <path value="Extension.value[x].coding.system" /> <fixedUri value="urn:oid:2.16.578.1.12.4.1.1.9101" /> </element> </differential> </StructureDefinition>