Field and Subfield Repeatability
Theoretically, all fields and subfields may be repeated. The nature of the data, however, often precludes repetition. For example, a community information record may contain only one 1XX primary name field ; a field 110 (Primary Name - Corporate) may contain only one subfield $a (Corporate name or jurisdiction name as entry element) but may contain more than one subfield $b (Subordinate unit). The repeatability/nonrepeatability of each field and subfield is specified in the format.
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