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→2.3 Data Fields Set of Principles
values when required. Subfield identifiers will be given values for identification rather than for file
arrangement. Apart from subfield $6 which, when present, must always be the first subfield in the
field, there will be no specified order for subfield identifiers, as order is determined by the data. [https://www.iso.org/standard/18372.html ISO10324 ] prescribes the sequence and format of data elements in order to ensure consistent recording and
interpretation; however it does not prescribe the sequence in which data areas are to be displayed in a
holdings statement.