Definition and scope:

The 00X variable control fields contain the record control number and coded information used in the processing of machine-readable authority records (MARC records).

Each data element in the fixed-length 005 and 008 fields is positionally defined.  A more detailed explanation of these positionally defined data elements can be found in each field description.

Variable control fields have no indicators or subfield codes.

The code NR or R below indicates whether a field can be repeated in a record.

For information on a specific variable control field, select a topic:

001  Control Number  (NR)

003  Control Number Identifier  (NR)

005  Date and Time of Latest Transaction  (NR)

008  Fixed-Length Data Elements  (NR)

See also:

Variable Data Fields  (0XX-999)

MARC 21 Format for Authority Data:  Contents