PLP Redirection Rules–Match Only 

The difference in the processing when the Match Only flag is checked or not checked is very subtle, but it is important to understand. 

How does the 'match only' field work? 

1. Match Only is checked 

If you check the 'match only' box, then a record that meets the redirect criteria will NOT be redirected if any other unselected crosscheck also fails. For example, if– 

Match Only is checked 
XAUTH is checked  

–then if the only crosschecks that fail are XAUTH, the record will be redirected.  

2. Match Only is not checked 

If you do not check the 'match only' box, then a record that meets the redirect criteria WILL be redirected, even if other unselected crosschecks also fail. For example, if– 

Match Only is not checked 
XAUTH is checked  

–then if the failed crosschecks include XAUTH, the record will be redirected.  

Consider two situations. 

1. Let's say that based on your research you have found that many ISBN matches fail on the X300A alone, and that based on your experience reviewing these XCFails in MCU, the records are always for the same item.  

2. On the other hand, based on that same vast experience of looking at records in MCU, you know that if a record fails on X300A and some other crosschecks, like X260B, XDATE, X250A, etc., then the records may not be for the same item and need to be reviewed in the MCU. 

'Match only' allows you to redirect records in the first situation, and yet not redirect records in the second situation. For example, we define an XCRR that redirects ISBN searches that fail on X300A to the NoMatch file (XCFail-to-NoMatch). If the 'Match only' flag is set for this rule, then if any other crosscheck besides X300A fails, the record will not be redirected to NoMatch; on the other hand, if the 'Match Only' Flag is not set for this rule, then any records that fail on X300A, regardless of whatever other crosschecks they fail on, will be redirected to NoMatch. 

Examples 

1. Redirection Rule:  

Primary Key=OCLC    
Crosschecks=X260A, X260B    
Match Only=True 

If a library record matches a DB record on OCLC number, and fails on crosschecks X260A, X260B, XDATE then this redirection rule does not match because the 'Match Only' flag is set and XDATE is not in the crosschecks for this rule. 

2. Redirection Rule:  

Primary Key=OCLC    
Crosschecks=X260A, X260B    
Match Only=False 

If a library record matches a DB record on OCLC number, and fails on crosschecks X260A, X260B, XDATE then this redirection rule matches because all crosschecks in the rule are present in the XCfails. 

3. Redirection Rule:  

Primary Key=OCLC	
Crosschecks=X260A, X260B, X300A    
Match Only=True 

If a library record matches a DB record on OCLC number, and fails on crosschecks X260A, X260B, X245H then this redirection rule does not match because the 'Match Only' flag is set and X245H is not in the crosschecks for this rule. 

plp/xcrr_matchonly.txt · Last modified: 2013/04/27 09:09 (external edit)
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