In choosing between repeating a field vs. repeating a subfield: If the only addition to an existing field is an additional term from the same vocabulary, repeat the affected subfield. If the vocabulary source differs, repeat the field. Overall best practice: repeat the field when needed for clarity. | In choosing between repeating a field vs. repeating a subfield: If the only addition to an existing field is an additional term from the same vocabulary, repeat the affected subfield. If the vocabulary source differs, repeat the field. Overall best practice: repeat the field when needed for clarity. |