Invariant: pat-cnt-2or3-char
Description: "The content of the country element (if present) SHALL be selected EITHER from ValueSet ISO Country Alpha-2 http://hl7.org/fhir/ValueSet/iso3166-1-2 OR MAY be selected from ISO Country Alpha-3 Value Set http://hl7.org/fhir/ValueSet/iso3166-1-3, IF the country is not specified in value Set ISO Country Alpha-2 http://hl7.org/fhir/ValueSet/iso3166-1-2."
Severity: #warning
Expression: "country.empty() or (country.memberOf('http://hl7.org/fhir/ValueSet/iso3166-1-2') or country.memberOf('http://hl7.org/fhir/ValueSet/iso3166-1-3'))"