MARC 21 Concise Authority: Leader and Directory

This is an ARCHIVED VERSION of the 2000 electronic edition of the MARC 21 Concise Formats. Please see www.loc.gov/marc/concise/ for the most up-to-date version of the electronic MARC 21 Concise Formats.

• LEADER
• DIRECTORY

Information for Translators and Other Users
Items highlighted in red indicate changes made after the 1998 edition of the USMARC Concise Formats was published (This publication included the 1993 base text, along with Updates No. 1 (July 1995) and No. 2 (March 1997) of the USMARC Format for Authority Data).

LEADER

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

• 00-04 - Record length
  The computer-generated, five-character numeric string that specifies the length of the entire record. The number is right justified and each unused position contains a zero.
• 05 - Record status
  A one-character code that indicates the relation of the record to a file.
  • a - Increase in encoding level
    The Encoding level (Leader/17) of the record has been changed from code o (incomplete) to code n (complete).
  • c - Corrected or revised
    A change other than in the Encoding level code has been made to the record.
  • d - Deleted
    The delete code used when neither code s nor code x is applicable.
  • n - New
  • s - Deleted; heading split into two or more headings
  • x - Deleted; heading replaced by another heading
• 06 - Type of record
  A code that indicates the characteristics of and defines the components of the record.
  • z - Authority data
• 07-08 - Undefined character positions
  Each contains a blank (#)
• 09 - Character coding scheme
  A one-character code that identifies the character coding scheme used in the record.
  • # - MARC-8
    The character coding in the record uses the 8-bit character sets described in MARC 21 Specifications for Record Structure, Character Sets, and Exchange Media
  • a - UCS/Unicode
    The character coding in the record makes use of characters from the Universal Coded Character Set (UCS)(ISO 10646), or Unicode
• 10 - Indicator count
  The computer-generated number 2 that indicates the number of character positions used for indicators in a variable data field.
• 11 - Subfield code length
  The computer-generated number 2 that indicates the number of character positions used for each subfield code in a variable data field.
• 12-16 - Base address of data
  The 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.
• 17 - Encoding level
  A one-character code that indicates whether the record is complete.
  • n - Complete authority record
    The record meets national level record requirements.
  • o - Incomplete authority record
• 18-19 - Undefined character positions
  Each contains a blank (#)
• 20-23 - Entry map
  Four computer-generated, single-digit numeric characters that indicate the structure of each entry in the Directory.
• 20 - Length of the length-of-field portion
  Contains a 4
• 21 - Length of the starting-character-position portion
  Contains a 5
• 22 - Length of the implementation-defined portion
  Contains a 0
• 23 - Undefined
  Contains a 0

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DIRECTORY

Character Positions

• 00-02 - Tag
  Three numeric or alphabetic (uppercase or lowercase, but not both) characters that identify an associated field.
• 03-06 - Field length
  Four numeric characters that indicate the length of the field, including indicators, subfield codes, data, and the field terminator. The number is right justified and each unused position contains a zero.
• 07-11 - Starting character position
  Five numeric characters that indicate the starting character position of the field relative to the Base address of data (Leader/12-16) of the record. The number is right justified and each unused position contains a zero.

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