Eksterne kodelister
ISO 19103 CSL Requirement 9. Code lists shall be used if none, or only the likely or an initial set of allowed values are known.
ISO 19103 CSL Recommendation 3. Extensions of a code list use the existing code list values and merely add additional unique values. These additional values should not replace an existing code by changing the name or definition, or have the same definition as an existing value.
ISO 19103 CSL Recommendation 4. The value of the tagged value “codeList” should be a persistent URI identifying the code list.