ALL: Required if applicable. One-character code.
Default:
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.
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 a 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 245–260 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 245–260 or 4xx require romanization, see code r.
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.
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 245–260 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 245–260 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.
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