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plp:gmd_processing [2010/06/11 14:55]
plp:gmd_processing [2013/04/27 09:09] (current)
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 +====== 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. 
 +
 +===== Osmosis GMD Processing ======
 +  * a copy of the 245 field is extracted from the record
 +  * subfield $h is extracted from the 245 field
 +  * [[plp:normalization|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.
 + 
 +===== Data extraction =====
 +
 +Subfield $h is extracted from the copy of the 245 field obtained above
 +
 +===== 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)
 +  * [[plp:normalization|standard normalization]] is applied
 +  * 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: \\
 +   <code>ACTIVITY, ART (eg. ART ORIGINAL, ART REPRODUCTION), CARTOGRAPHIC, 
 +   CHART, DIORAMA, FLASH, GAME, MICROSCOPE, MODEL, MULTIMEDIA, MUSIC, 
 +   OBJECT, PICTURE, REALIA, SLIDE, TECHNICAL, TEXT, TOY, TRANSPARENCY
 +   </code>
 +
 +===== 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.
 +  
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