256 Computer File Characteristics

Field definition and scope:

Field 256 is used to record characteristics pertaining to a computer file. It may contain information about the type of file (e.g., Computer programs), the number of records, statements, etc. (e.g., 1250 records, 5076 bytes).

The National level record requirement for this field is Mandatory if applicable.

Field 256 is NOT repeatable.

Guidelines for applying content designators:

The data in this field is customarily entered as specified by various cataloging rules. In records formulated following cataloging rules based on International Standard Bibliographic Description (ISBD) principles, a relationship exists between prescribed ISBD punctuation and the identification of specific subfield data. AACR 2 formulated bibliographic records follow ISBD principles for description and punctuation. Most of the examples in this section illustrate the prescribed ISBD punctuation associated with specific subfields.

For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	MLR	Repeatability
Field 256	Computer File Characteristics	A	A	NR
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	Computer file characteristics	M	M	NR
$6	Linkage	A	A	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Punctuation

Content designator history:

Prior to the definition of this field in 1987, file characteristics were recorded in subfield $a of field 300 (Physical Description).