Variable fields:
The data in a USMARC record is organized into variable fields, each identified by a three-character numeric tag that is stored in the Directory entry for the field. Each field ends with a field terminator character. The last variable field in a record ends with both field terminator and a record terminator (ASCII 1D16)
The variable data fields are grouped into blocks according to the first character of the tag, which identified the function of the data within the record. The type of information in the field is identified by the remainder of the tag. In the USMARC Format for Community Information, the variable data field blocks are:
0XX Control Information, numbers, and codes
1XX Primary name
2XX Titles, addressed
3XX Physical information, etc.
4XX Series information
5XX Notes
6XX Subject access fields
7XX Added entries other than subject
8XX ALTERNATE graphics
9XX Reserved for local implementation
Within the 1XX, 4XX, 6XX, and 7XX blocks, certain parallels of content designation are preserved. The following meanings are given to the final two characters of the tag of fields in these blocks:
X00 Personal names
X10 Corporate names
X11 Meeting names
X30 Publication titles
X40 Titles (of programs, events, etc. or series)
X50 Topical terms
X51 Graphic names
There are two types of variable fields:
Within variable data fields, two kinds of content designation are used:
See also:
Components of a USMARC Community Information Record
