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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. | ||