Variable control fields:

The variable control fields are identified by a field tag in the Directory with the pattern 00X, where X may be any digit except zero (0), for example, 001, 005, 007. The variable control fields are structurally different from the variable data fields because the variable control fields contain neither indicator positions nor subfield codes . They may contain either a single data element or a series of fixed-length data elements identified by relative character position.

For information about the variable control fields in a specific MARC format, select:

Variable Control Fields (Authority)

Variable Control Fields (Bibliographic)

Variable Control Fields (Classification)

Variable Control Fields (Community Information)

Variable Control Fields (Holdings)