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 USMARC classification 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:

USMARC Format for Classification Data: Contents