<status value="active" /> <experimental value="false" /> <date value="2026-05-08" /> <publisher value="Example Org" /> <description value="A simple value set with three answers: yes, no, or unknown." /> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v2-0136" /> <concept> <code value="Y" /> <display value="Yes" /> </concept> <concept> <code value="N" /> <display value="No" /> </concept> </include> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-NullFlavor" /> <concept> <code value="UNK" /> <display value="Unknown" /> </concept> </include> </compose> </ValueSet>