X245H Crosscheck

The purpose of this crosscheck is to prevent records from matching when the items have different titles.

This crosscheck follows the same data extraction rules as for the title as a primary key, with the following exceptions:

• subfield $h (GMD) is ignored
• each retrieved title is truncated to 40 characters

• standard normalization is applied

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.

Important: unlike the primary key query for TITLE, the title crosscheck does not consider the GMD, so be sure to enable X245H.