class Object

Constants

CAT_URI
EXAMPLE_RECORD_FILE

EXAMPLE_RECORD_FILE=‘../marc/catalog/stf.00.mrc’

LEADER_STATUS_CODES
From http://www.loc.gov/marc/authority/adleader.html
System-Generated Elements - The following Leader elements are usually system generated:

00-04         Logical record length

   05 - Record status:
    a - Increase in encoding level
    c - Corrected or revised
    d - Deleted
    n - New
    o - Obsolete
    s - Deleted; heading split into two or more headings
    x - Deleted; heading replaced by another heading

   06 - Type of record
    z - Authority data

07-08         Undefined character positions

   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
    n - Complete authority record
    o - Incomplete authority record

20-23         Entry map

18-19 - Undefined character positions

   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

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.

example:

record.leader

> “00774cz a2200253n 4500”

00-04: '00774' - record length
05:    'c' - corrected or revised
06:    'z' - always 'z' for authority records
09:    'a' - UCS/Unicode
12-16: '00253' - base address of data, Length of Leader and Directory
17:    'n' - Complete authority record
SUL_URI

Create SUL LOD…

Public Instance Methods

leader_parse(record) click to toggle source
# File lib/marc2linkeddata/readMarcCatalog.rb, line 97
def leader_parse(record)
  leader = {
    :length => record.leader[0..4].to_i,
    :status => record.leader[5],  # LEADER_STATUS_CODES[ record.leader[5] ]
    :type => record.leader[6],    # always 'z' for authority records
    :encoding => record.leader[9],  # TODO: translate letter code into ruby encoding string
    :data_address => record.leader[12..16].to_i,
    :complete => record.leader[17].include?('n')
  }
end