Library of Congress >> MARC >> Community Information >> Leader

Leader (NR)


MARC 21 Community Information
January 2000

Indicators and Subfield Codes
This field has no indicators or subfield codes; the data elements are positionally defined.
Character Positions
00-04 - Record length

05 - Record status
c - Corrected or revised
d - Deleted
n - New

06 - Type of record
q - Community information

07 - Kind of data
n - Individual
o - Organization
p - Program or service
q - Event
z - Other

08 - Undefined character position
# - Undefined

09 - Character coding scheme
# - MARC-8
a - UCS/Unicode

10 - Indicator count
2 - Number of character positions used for indicators


11 - Subfield code length
2 - Number of character positions used for a subfield code

12-16 - Base address of data
[number] - Length of Leader and Directory

17-19 - Undefined character positions
# - Undefined

20 - Length of the length-of-field portion
4 - Number of characters in the length-of-field portion of a Directory entry

21 - Length of the starting-character-position portion
5 - Number of characters in the starting-character-position portion of a Directory entry

22 - Length of the implementation-defined portion
0 - Number of characters in the implementation-defined portion of a Directory entry

23 - Undefined
0 - Undefined


FIELD DEFINITION AND SCOPE

Fixed field that comprises the first 24 character positions (00-23) of each record and provides information for the processing of the record.

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 MARC 21 Specifications for Record Structure, Character Sets, and Exchange Media.


GUIDELINES FOR APPLYING CONTENT DESIGNATORS

CHARACTER POSITIONS

00-04 - Record length
Five-character number equal to the length of the entire record, including itself and the record terminator. The number is right justified and unused positions contain zeros.

05 - Record status
Relationship of the record to a file for file maintenance purposes.
c - Corrected or revised
Addition or change has been made to the record.
d - Deleted
Record has been deleted.
n - New
Record is a newly input record.

06 - Type of record
Characteristics and definitions of the components of the record.
q - Community information
Record constitutes a community information record. Community information records describe non-bibliographic resources that fulfill the information needs of a community. The kind of data found in the community information record is identified by the code in Leader/07.

07 - Kind of data
Kind of data found in the record.
n - Individual
Individual with a particular expertise (e.g., teacher, interpreter, storyteller, civic leader).
o - Organization
Organization or any group (e.g., corporation, association, club, agency).
p - Program or service
Offering or activity of a group or institution which carries out the the organization's purpose.
Examples include driver education, day care placement, toy collection drive, blood bank.
q - Event
Scheduled happening (e.g., a lecture, play, concert series, sporting contest, festival, annual celebration, regularly scheduled meeting).
z - Other
Entity other than those specified by the other defined codes (e.g., a facility such as a planetarium on a university campus.
Note that separate records are not created for equipment. Information about equipment available from a community information entity that is to be used at the entity is recorded in subfield $e (Equipment Available) of field 311 (Meeting Rooms and Facilities Available); information about equipment available from a community information entity that may be used outside of the entity is recorded in field 312 (Equipment Available).

08 - Undefined character position
Undefined; contains a blank (#).

09 - Character coding scheme
Character coding scheme used in the record.
Coding scheme used affects the number of octets needed per character, the placement of non-spacing characters, and the use of escape sequences and may affect the character repertoire. Detailed information on the character sets used in MARC 21 records is contained in MARC 21 Specifications for Record Structure, Character Sets, and Exchange Media.
# - MARC-8
Character coding in the record uses the 8-bit character sets described in MARC 21 Specifications for Record Structure, Character Sets, and Exchange Media. Non-default character sets used are identified in field 066.
a - UCS/Unicode
Character coding in the record makes use of characters from the Universal Coded Character Set (UCS) (ISO 10646), or Unicode™, an industry subset.

10 - Indicator count
Computer-generated number 2 that indicates the number of character positions used for indicators in a variable data field.
An indicator character position contains a code which conveys information that interprets or supplements the data found in the field. In MARC, two character positions at the beginning of each variable data field are reserved for indicators; therefore, the Indicator count is always 2.
2 - Number of character positions used for indicators

11 - Subfield code length
Computer-generated number 2 that indicates the number of character positions used for each subfield code in a variable data field.
(Each data element in a variable data field is identified by a subfield code.) In MARC 21, a subfield code consists of a delimiter ($) and a lowercase alphabetic or numeric data element identifier; therefore, the Subfield code count is always 2.
2 - Number of character positions used for a subfield code

12-16 - Base address of data
Computer-generated, five-character numeric string that indicates the first character position of the first variable control field in a record. The number is right justified and each unused position contains a zero.
The number is the base from which the starting character position of all the other fields in the record is addressed in the Directory. (The starting character position in the Directory entry for each field of the record is relative to the first character of the first variable control field rather than the beginning of the record.) The Base address of data is equal to the sum of the lengths of the Leader and the Directory, including the field terminator character at the end of the Directory.
[number] - Length of Leader and Directory

17-19 - Undefined character positions
Undefined three character positions; each contains a blank (#).

20 - Length of the length-of-field portion
Always contains a 4.
4 - Number of characters in the length-of-field portion of a Directory entry

21 - Length of the starting-character-position portion
Always contains a 5.
5 - Number of characters in the starting-character-position portion of a Directory entry

22 - Length of the implementation-defined portion
Always contains a 0.
In MARC 21, a Directory entry does not contain an implementation-defined portion.
0 - Number of characters in the implementation-defined portion of a Directory entry

23 - Undefined
Undefined; always contains a 0.
0 - Undefined

INPUT CONVENTIONS

System-Generated Elements - The following Leader elements are usually system generated:
00-04 Logical record length
08 Undefined character position
09 Character coding scheme
10 Indicator count
11 Subfield code count
12-16 Base address of data
17-19 Undefined character positions
20-23 Entry map
It is common for default values in other Leader elements to be generated automatically as well.
Capitalization - Alphabetic codes are input as lower case letters.

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