<ClinicalUseDefinition xmlns="http://hl7.org/fhir"><id value="example-warning"/><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"><valueCode value="brr"/></extension><type value="warning"/><category><coding><system value="http://hl7.org/fhir/clinical-use-definition-category"/><code value="DriveAndMachines"/><display value="Effects on Ability to Drive and Use Machines"/></coding></category><subject><reference><reference value="MedicinalProductDefinition/example"/></reference></subject><warning><description value="May cause drowsiness. Avoid driving or operating heavy machinery."/></warning></ClinicalUseDefinition>