GMD processing §

Here is a summary of the GMD processing that is used by TMQ in various software modules. 

Since many GMDs are 'made-up' by the cataloger, not all of the data extracted from this field is retained in some PLP crosschecks.  

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Osmosis GMD Processing §

  • a copy of the 245 field is extracted from the record 
  • subfield $h is extracted from the 245 field 
  • standard normalization is applied, with the exception that the data is shifted to lowercase 
  • the plural form of any GMD listed in ACCR2 is replaced with its singular form (eg. 'pictures' becomes 'picture') 
  • the following replacements are made: 
    • 'computer file' becomes 'electronic resource' 
    • 'website' becomes 'electronic resource' 
    • 'interactive multimedia' becomes 'electronic resource' 
    • 'map' becomes 'cartographic material' 
    • 'globe' becomes 'cartographic material' 
    • 'large print' becomes 'text large print' 
    • 'videocassette' becomes 'videorecording' 
    • 'video recording' becomes 'videorecording' 
    • 'dvd videorecording' becomes 'videorecording' 
    • 'dvd' becomes 'videorecording' 
    • 'sound cassette' becomes 'sound recording' 
    • 'compact disc' becomes 'sound recording' 

If any of these replacements are made, the copy of the 245 field in the record being checked is updated with the change. 

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Data extraction §

Subfield $h is extracted from the copy of the 245 field obtained above 

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Normalization §

  • If the GMD contains '(braille)', or any subject heading contains the word 'braille', set the GMD for that record to 'braille' 
  • all parenthetical qualifiers are extracted, then deleted (eg., '[text (large print)]' becomes '[text]'  
  • any data following the closing bracket is deleted (in the event a subfield $b or $c was omitted) 
  • If a record contains a normalized GMD that matches any GMD strings in the following list (this list is based upon an LCRI, and so reflects an LC policy), its GMD is set to null:
     
ACTIVITY, ART (eg. ART ORIGINAL, ART REPRODUCTION), CARTOGRAPHIC, 
   CHART, DIORAMA, FLASH, GAME, MICROSCOPE, MODEL, MULTIMEDIA, MUSIC, 
   OBJECT, PICTURE, REALIA, SLIDE, TECHNICAL, TEXT, TOY, TRANSPARENCY
    

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Processing rules §

  • If one record has the GMD 'electronic resource', and the other record has either the GMD 'microform', or no GMD at all, do not fail the crosscheck 
  • If, at this point, the GMDs in the records being compared are not the same, the crosscheck fails. 
plp/gmd_processing.txt · Last modified: 2013/04/27 09:09 (external edit)
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