<status value="draft"/> <experimental value="true"/> <date value="2015-06-22"/> <description value="A sample value set where there's no known code system"/> <compose> <include> <system value="http://not-a-known-code-system"/> <version value="2.36"/> <concept> <code value="not-known-code"/> </concept> <concept> <code value="not-known-code2"/> </concept> </include> </compose> </ValueSet>