Marc 21 Record Format -- Leader Section

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MARC21 ::= Leader + Record Directory + Variable Fields + X'1B'

Leader ::= Leader1 + Leader2 + Leader3 + Leader4 + Leader5 -- char(24)
Leader1 ::= Logical Record Length + Record Status + Record Type
Leader2 ::= Bibiographic Level + Type of Control + Character Coding Scheme
Leader3 ::= Indicator Count + Subfield Code Count + Base Address of Data
Leader4 ::= Encoding Level + Descriptive Catalog Form + Linked Record Requirement
Leader5 ::= Entry Map

Logical Record Length ::= '99999' -- char(5)

Logical record length, right justified, zero padded

Record Status ::= 'A' | 'C' | 'D' | 'N' | 'P' -- char(1)

Indicates the relation of the record to a file.

Record Type ::= 'A' | 'C' | 'D' | 'E' | 'F' | 'G' | 'I' | 'J' | 'K' | 'M' | 'O' | 'P' | 'R' | 'T' -- char(1)

Indicates the characteristics of and defines the components of the record.
'A' - Language material -- This code is also used for microforms of language material.
'C' - Printed music -- This code is also used for microforms of printed music.
'D' - Manuscript music -- This code is also used for microforms of manuscript music.
'E' - Cartographic material -- This code is also used for microforms of printed maps.
'F' - Manuscript cartographic material -- This code is also used for microforms of manuscript maps.
'G' - Projected medium -- The described item is a motion picture, videorecording, filmstrip, slide, transparency, or material specifically designed for overhead projection.
'I' - Nonmusical sound recording
'J' - Musical sound recording
'K' - Two-dimensional nonprojectable graphic -- This code is used for items such as activity cards, charts, collages, computer graphics, drawings, duplication masters, flash cards, paintings, photonegatives, photoprints, pictures, postcards, posters, prints, spirit masters, study prints, technical drawings, transparency masters, photomechanical reproductions, and reproductions of any of these.
'M' - Computer file -- This code indicates that the content of the record is for the following classes of electronic resources: computer software (including programs, games, fonts), numeric data, computer-oriented multimedia, online systems or services. For these classes of materials, if there is a significant aspect that causes it to fall into another Leader/06 category, the code for that significant aspect is used instead of code m (e.g., vector data that is cartographic is not coded as numeric but cartographic). Other classes of electronic resources are coded for their most significant aspect (e.g., language material, graphic, cartographic material, sound, music, moving image). In case of doubt or if the most significant aspect cannot be determined, consider the item a computer file.
'O' - Kit -- The described item contains a mixture of components from two or more types of items, no one of which is the predominant constituent of the kit.
'P' - Mixed material -- Indicates that there are significant materials in two or more forms that are usually related by virtue of their having been accumulated by or about a person or body. Includes archival fonds and manuscript collections of mixed forms of materials, such as text, photographs, and sound recordings.
'R' - Three-dimensional artifact or naturally occurring object -- This code is used for such man-made objects as models, dioramas, games, puzzles, simulations, sculptures and other three-dimensional art works and their reproductions, exhibits, machines, clothing, toys, and stitchery. It also includes such naturally occurring objects as microscope specimens and other specimens mounted for viewing.
'T' - Manuscript language material

Bibiographic Level ::= 'A' | 'B' | 'C' | 'D' | 'M' | 'S' -- char(1)

Type of Control ::= ' ' | 'A' -- char(1)

Archival or no specific type.

Character Coding Scheme ::= ' ' | 'A' -- char(1)

one-character code that identifies the character coding scheme used in the record. 'A' equals UCS/Unicode, otherwise MARC-8.

Indicator Count ::= '2' -- char(1)

Columns used for indicators, always 2

Subfield Code Count ::= '2' -- char(2)

columns used for subfield codes, always 2

Base Address of Data ::= '99999' -- char(5), right justified, zero padded

indicates the first character position of the first variable control field in a record.

Encoding Level ::= ' ' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | 'U' | 'Z' -- char(1)

Indicates the fullness of the bibliographic information and/or content designation of the MARC record.

Descriptive Catalog Form ::= ' ' | 'A' | 'I' | 'U' -- char(1)

Indicates the descriptive cataloging form reflected in the record.

Linked Record Requirement ::= ' ' | 'R' -- char(1)

A one-character code that indicates whether a note containing basic identification information (i.e., main entry and title, main entry and uniform title, main entry under uniform title, title, uniform title, Standard Technical Report Number, or report number) can be generated from a Linking Entry field (76X-78X).

Entry Map ::= '4500' -- char(4)

Four computer-generated, single-digit numeric characters that indicate the structure of each entry in the Directory.