<status value="draft" /> <date value="2022-10-17T09:09:13.9562003+00:00" /> <publisher value="Healthdata.be (Sciensano)" /> <contact> <name value="Service portal – healthdata.be" /> <telecom> <system value="url" /> <value value="https://sciensano.service-now.com/sp" /> <use value="work" /> </telecom> </contact> <description value="An extension to provide the frequency of smoking/tobacco use. A fitting SNOMED code does not yet exist, which complicates the usage of `Observation.component` for holding the frequency qualifier. Therefore an extension is used." /> <copyright value="Copyright and related rights waived via CC0, https://creativecommons.org/publicdomain/zero/1.0/. This does not apply to information from third parties, for example a medical terminology system. The implementer alone is responsible for identifying and obtaining any necessary licenses or authorizations to utilize third party IP in connection with the specification or otherwise." /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="Observation" /> </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="https://fhir.healthdata.be/StructureDefinition/ext-SmokingStatus.FrequencyQualifier" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <short value="Frequency" /> <definition value="The frequency of smoking or tobacco use." /> <alias value="Frequentie" /> <type> <code value="CodeableConcept" /> </type> <binding> <strength value="extensible" /> <description value="Frequency qualifier codes" /> <valueSet value="https://fhir.healthdata.be/ValueSet/FrequencyQualifier" /> </binding> </element> </differential> </StructureDefinition>