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MRec:  Modified Record

Bytes

ALL: 008/38

Input standards

ALL: Required if applicable. One-character code. Default: blank character

Definition

 
All formats

Whether bibliographic information was modified for entry into machine-readable form.

Guidelines

 
Transcribing printed copy

Use the following guidelines when transcribing LC or NLM printed copy. If more than one MRec code applies, use the codes according to the following order of preference: s, d, x, r, o.

 
blank character

Leave the default value of blank if transcribing LC or NLM cataloging exactly as found on LC or NLM printed copy. Modernization of a form of heading or of subject terminology does not require an MRec code.

If the printed copy has incidental non-Latin characters, unusual mathematical symbols or other special characters not included in the OCLC character set, follow these guidelines:

  • Consider the copy to have incidental non-Latin or special characters if these characters occur in one field (or a portion of one field) among fields 245–264 or 4xx.
  • Romanize non-Latin characters and describe special symbols with a word or phrase.
  • Enclose the romanized or modified characters within brackets. (Romanization may apply to a single letter, to a single word, to several words or to the entire field.) Since the brackets identify modified characters, you need not indicate modification. Leave MRec blank.
  • If two or more fields among fields 245–264 or 4xx require romanization, see code r.
 
s

Use code s to indicate that some data was omitted in order to comply with system limits. MARC bibliographic records have a maximum length of 99,999 characters. For more information, see MARC 21 Record Specifications for Record Structure, Character Sets, and Exchange Media (http://www.loc.gov/marc/specifications/specrecstruc.html).

 
d

If a pre-AACR2 record (e.g., retrospective cataloging being converted to machine-readable form), has a "dashed-on" entry, do not enter the dashed-on information. Enter your OCLC symbol in field 040 subfield ‡d and use code d. Create a separate bibliographic record describing the dashed-on item.

 
r

If LC or NLM cataloging is in a non-Latin alphabet, enter the record in romanized form. LC prints non-Latin cataloging for Chinese, Japanese, Korean, Arabic, Persian and the Hebraic script. In such cases, use code r and enter your OCLC symbol in 040 subfield ‡d

 
o

If LC or NLM cataloging is itself romanized, enter the record in romanized form. LC romanizes its printed cataloging for non-Latin alphabets, except Chinese, Japanese, Korean, Arabic, Persian and the Hebraic script. In such cases, use code o but do not enter your OCLC symbol in field 040 subfield ‡d since the machine-readable record matches the printed record.

Original cataloging

Use the following guidelines if you are inputting original cataloging and other non-LC or non-NLM cataloging. If more than one MRec code applies, use codes according to the following order of preference: s, r, o.

 
blank character

Not modified

If the original bibliographic data has incidental non-Latin characters, unusual mathematical symbols or other special characters not included in the character set, follow these guidelines:

  • Consider the data to have incidental non-Latin or special characters if these characters occur in one field (or a portion of one field) among fields 245–264 or 4xx.
  • Romanize non-Latin characters and describe special symbols using a word or phrase.
  • Enclose the romanized or modified characters within brackets. Romanization may apply to a single letter, to a single word, to several words or to the entire field. Since the brackets identify modified characters, no additional indication of modification is necessary, leave MRec blank.
  • If two or more fields among fields 245–264 or 4xx require romanization. See codes r and o.
 
o

If the original bibliographic data are in a non-Latin alphabet, enter the record in romanized form. If LC printed cataloging for the item would also be romanized, use code o. LC romanizes its printed cataloging for non-Latin alphabets, except Chinese, Japanese, Korean, Arabic, Persian and Hebraic script.

 
r

If the original bibliographic data are in a non-Latin alphabet, enter the record in romanized form. If LC printed cataloging for the item would also be in a non-Latin alphabet, use code r. LC prints non-Latin cataloging for Chinese, Japanese, Korean, Arabic, Persian and Hebraic script.

 
s

Use code s to indicate that some data was omitted in order to comply with system limits. MARC bibliographic records have a maximum length of 99,999 characters. For more information, see MARC 21 Record Specifications for Record Structure, Character Sets, and Exchange Media (http://www.loc.gov/marc/specifications/specrecstruc.html).

Codes

 
 
blank character

Not modified

 
d

Dashed-on information omitted. Pre-AACR2 only.

 
o

Completely romanized/printed cards romanized

 
r

Completely romanized/printed cards in script

 
s

Shortened

 
u

Unknown. Obsolete. Do not use.

 
x

Missing characters

Indexing

For information on material type indexing in various OCLC services, see Searching WorldCat Indexes, Material Type (includes links in Notes row to RDA terms and codes and Format or Document codes and values).

For information on material type names and codes (based mainly on the Leader, 006, 007, 008), see Searching WorldCat Indexes, Material Type Names and Codes.