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plp:crosschecks:xtitl [2011/03/07 14:18]
tmqinc
plp:crosschecks:xtitl [2013/04/27 09:09] (current)
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 +**PLP Crosschecks--XTITL**
 +
 +====== X245H Crosscheck ======
 +
 +The purpose of this crosscheck is to prevent records from matching when the items have different titles. 
 +
 +===== Data extraction =====
 +
 +This crosscheck follows the same data extraction rules as for the [[plp:primary_keys:primary_title|title as a primary key]], with the following exceptions:
 +  * subfield $h (GMD) is ignored
 +  * each retrieved title is truncated to 40 characters
 +
 +===== Normalization =====
 +
 +  * [[plp:normalization|standard normalization]] is applied
 +
 +===== Processing rules =====
 +
 +Results retrieved from the 245 field of each record are compared first; if that fails, the comparison is expanded to include all alternate titles (246) in each record.
 +
 +  * Must match in both records. A missing title fails the match.
 +
 +===== Note =====
 +
 +Important: unlike the primary key query for TITLE, the title crosscheck does not consider the GMD, so be sure to enable X245H. 
  
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