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
- 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
- # - MARC-8
- a - UCS/Unicode
|
| 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