Variable Control Fields

The variable control fields contain record control numbers and other kinds of control and coded information that are used in the processing of separate USMARC holdings records. These fields have no indicators or subfield codes.

These fields are identified by a field tag in the Directory but they contain neither indicator positions nor subfield codes. The variable control fields are structurally different from the variable data fields. They may contain either a single data element or a series of fixed-length data elements identified by a relative character position. The fixed-length fields contain various kinds of information and have data elements that are positionally defined. A more detailed explanation of positionally defined data elements is found in the sections describing specific fields.

001 Control Number (NR)

003 Control Number Identifier (NR)

004 Control Number for Related Bibliographic Record (NR)

005 Date and Time of Latest Transaction (NR)

007 Physical Description Fixed Field (NR)

008 Fixed-Length Data Elements (NR)

See also:

USMARC Holdings Formats: Contents