Die Datensatzkennung (engl. Leader) ist ein festes Feld, welches die ersten 24 Zeichenpositionen (00-23) jedes Datensatzes umfasst und Informationen für die Verarbeitung des Datensatzes enthält.
| Position |
Beschreibung (Englisch / Deutsch)
|
| 00-04 |
Record length / Länge des Datensatzes
|
| Diese Positionen enthalten eine vom Rechner erzeugte fünfstellige numerische Zeichenfolge, welche die Länge des gesamten Datensatzes angibt. Die Nummer ist rechtsbündig, wobei linksseitig fehlende Positionen mit Nullen besetzt sind.
|
| 05 |
Record status / Datensatzstatus
|
| a |
Increase in encoding level / Erhöhte Kodierungsebene
|
| c |
Corrected or revised / Korrigiert oder überarbeitet
|
| d |
Deleted / Gelöscht
|
| n |
New / Neu
|
| p |
Increase in encoding level from prepublication / Erhöhung der Kodierung seit der Vollpublikation
|
|
| 06 |
Type of record / Art des Datensatzes
|
| a |
Language material /
|
| c |
Notated music
|
d |
Manuscript notated music
|
e |
Cartographic material
|
f |
Manuscript cartographic material
|
g |
Projected medium
|
i |
Nonmusical sound recording
|
j |
Musical sound recording
|
k |
Two-dimensional nonprojectable graphic
|
m |
Computer file
|
o |
Kit
|
p |
Mixed materials
|
r |
Three-dimensional artifact or naturally occurring object
|
t |
Manuscript language material
|
|
| 07 |
Bibliographic level /
|
| a |
Monographic component part
|
b |
Serial component part
|
c |
Collection
|
d |
Subunit
|
i |
Integrating resource
|
m |
Monograph/Item
|
s |
Serial
|
|
| 08 |
Type of control /
|
| # |
No specified type
|
a |
Archival
|
|
| 09 |
Character coding scheme /
|
|
|
| 10 |
Indicator count /
|
| 2 |
Number of character positions used for indicators
|
|
| 11 |
Subfield code count /
|
| 2 |
Number of character positions used for a subfield code
|
|
| 12-16 |
Base address of data /
|
| [number] |
Length of Leader and Directory
|
|
| 17 |
Encoding level /
|
| # |
Full level
|
1 |
Full level, material not examined
|
2 |
Less-than-full level, material not examined
|
3 |
Abbreviated level
|
4 |
Core level
|
5 |
Partial (preliminary) level
|
7 |
Minimal level
|
8 |
Prepublication level
|
u |
Unknown
|
z |
Not applicable
|
|
| 18 |
Descriptive cataloging form
|
| # |
Non-ISBD
|
a |
AACR 2
|
c |
ISBD punctuation omitted
|
i |
ISBD punctuation included
|
n |
Non-ISBD punctuation omitted
|
u |
Unknown
|
|
| 19 |
Multipart resource record level /
|
| # |
Not specified or not applicable
|
a |
Set
|
b |
Part with independent title
|
c |
Part with dependent title
|
|
| 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 /
|
|
|
(Stand: 21.2.2109)
Weblinks
| Herausgeber |
Sprache |
Webseitentitel |
Anmerkungen |
 Library of Congress |
eng |
Leader (NR)wbm |
Offizielle Webseite |
Library of Congress