Variable Data Fields
Definition and scope:
The variable data fields include fields 01X-8XX. They are grouped into blocks according to the first character of the tag , which, with some exceptions, identifies the function of the data within the record. The type of information in the field is identified by the remainder of the tag. Each field is identified by a field tag in the Directory . Within variable data fields, two kinds of content designation are used: two indicator positions which are at the beginning of each field; and, a two-character subfield code which precedes each data element within the field.
Classification Numbers: Indicators, subfield codes, and input conventions for the classification number fields follow similar patterns. For detailed information, select: X53 Classification Numbers .
For information on a specific variable data field, select a topic:
(Shortcut: For information on a particular field, use the Search button at the top of the Help window to search by tag or subject area.)
Tag range: Field description:
0XX: Control Information, Numbers and Codes
1XX: Classification Numbers and Terms
2XX-5XX: Tracings and References
6XX: Notes
700-75X: Index Terms
8XX: Location Fields
See also:
Variable Control Fields (00X)
USMARC Format for Classification Data: Contents
