008/18 - 21 006/01 - 04 Computer files (CF) |
Undefined (Variable Control Field - Fixed-Length Data Element) |
Character position definition and scope:
These four character positions are undefined for Computer files. They contain blanks or fill characters.
Record requirements for National-level and Minimal-level records: Optional.
Content designator history:
As of 1995, the following definitions of these character positions were made obsolete:
008/18 Frequency
008/19 Regularity
See also:
006 and 008: Cross Reference Tables by Type of Material
006/01-17: Character Positions by Type of Material
006 Fixed-Length Data Elements - Additional Material Characteristics