<status value="active"/> <experimental value="false"/> <date value="2014-03-26"/> <description value="Countries of the world. ISO 3166, part 1, alpha-2 set."/> <compose> <include> <system value="urn:iso:std:iso:3166"/> <filter> <property value="code"/> <op value="regex"/> <value value="[A-Z]{2}"/> </filter> </include> </compose> </ValueSet>

Include codes from urn:iso:std:iso:3166 where code matches (by regex) [A-Z]{2}