Variable Control Fields
Definition and scope:
The 00X variable control fields contain the record control number and other kinds of control and coded information that are used in the processing of machine-readable classification records (MARC records). Each control field is identified by a field tag in the Directory and contains either a single data element or a series of fixed-length data elements identified by relative character position.
Variable control fields contain neither indicator positions nor subfield codes.
Each data element in the fixed-length field 008 is positionally defined. A more detailed explanation of positionally defined data elements can be found in 008 Fixed-Length Data Elements.
The codes NR or R below indicate 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: