Leader
Field Definition and Scope:
The Leader is the first field of a community information record. It is fixed in length at 24 character positions (00-23). The Leader consists of data elements that contain numbers or coded values that define the parameters for the processing of the record.
Character positions 20-23 comprise the Entry map for the Directory. They contain four one-character numbers that specify the structure of the entries in the Directory. More detailed information about the structure of the Leader is contained in USMARC Specifications for Record Structure, Character Sets, Tapes.
Guidelines for Applying Content Designators:
Leader/00 - 04 Logical record length
Leader/08 - 09 Undefined character positions
Leader/12 - 16 Base address of data
Leader/17 - 19 Undefined character positions
Leader/20-23 Entry map
Input Conventions:
System-generated Elements:
The following Leader elements are usually system generated:
| Logical record length |
| Undefined character positions |
| Indicator count |
| Subfield code count |
| Base address of data |
| Undefined character positions |
| Entry map |
Other Leader elements may also be system generated depending upon the capabilities of an individual system:
| Record status |
| Type of record |
| Kind of data |
Capitalization:
Alphabetical codes are input in lowercase.
Related USMARC Field or Document:
311 Meeting Rooms and Facilities Available
USMARC Specifications for Record Structure, Charactger Sets, Tapes
See also:
USMARC Community Information Format: Contents
00-04