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plp:crosschecks [2011/06/16 09:38]
plp:crosschecks [2013/04/27 09:09] (current)
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 +====== PLP Crosschecks ======
  
 +PLP is based on the premise that, when two records match on a primary key, all we really know about the two records in question is that they have the same match key. In order to determine whether these two records __really__ represent the same items, we have to compare many other fields in the records to one another. We refer to this comparison as the 'crosscheck' process.
 +
 +The crosschecks used in PLP are represented by brief mnemonic captions, like 'X245H' or 'XTITL'. The first letter is always an 'X' (plp-speak for crosscheck), and it can be followed by a MARC Tag/subfield, or some other indication of where the data being compared is extracted from in the MARC record.
 +
 +Because it is important to know how each crosscheck works, we have documented as precisely as possible, the MARC source of the data being compared, and the rules that are applied to this data internally before the comparison takes place. 
 +
 +Follow the links below to obtain the gory details on our crosschecks.
 +
 +  * [[plp:crosschecks:x010a|X010A -- LCCN (Library of Congress control number)]]
 +  * [[plp:crosschecks:x020a|X020A -- ISBN (International Standard Book number)]]
 +  * [[plp:crosschecks:x028a|X028A -- Publisher number]]
 +  * [[plp:crosschecks:x245h|X245H -- Medium or GMD ]]
 +  * [[plp:crosschecks:x250a|X250A -- Edition statement]]
 +  * [[plp:crosschecks:x260a|X260A -- Place of publication, distribution]]
 +  * [[plp:crosschecks:x260b|X260B -- Name of publisher, distributor]]
 +  * [[plp:crosschecks:x300a|X300A -- Physical description: Extent]]
 +  * [[plp:crosschecks:x300c|X300C -- Physical description: Dimensions]]
 +  * [[plp:crosschecks:x300e|X300E -- Physical description: Accompanying material]]
 +  * [[plp:crosschecks:x4xxv|X4XXV -- Series volume number]]
 +  * [[plp:crosschecks:xauth|XAUTH -- Author (main entry or added entry)]]
 +  * [[plp:crosschecks:xblev|XBLEV -- Bibliographic level]]
 +  * [[plp:crosschecks:xdate|XDATE -- Date of publication, distribution]]
 +  * [[plp:crosschecks:xdvdr|XDVDR -- DVD]]
 +  * [[plp:crosschecks:xform|XFORM -- Form of item]]
 +  * [[plp:crosschecks:xlgpr|XLGPR -- Large print]]
 +  * [[plp:crosschecks:xmtyp|XMTYP -- Material type (SMD)]]
 +  * [[plp:crosschecks:xoclc|XOCLC -- OCLC accession number]]
 +  * [[plp:crosschecks:xrtyp|XRTYP -- Type of record]]
 +  * [[plp:crosschecks:xtitl|XTITL -- Title]]
 +  * [[plp:crosschecks:xvtyp|XVTYP -- Type of visual material]]
 +  * [[plp:crosschecks:xxxxx|XXXXX -- Forced Fail]]
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