To preserve the integrity of OCLC/LCCN match processing, subsequent processing on different match keys must prohibit the matching of records with different LCCNs or OCLC numbers.
This is the first of several articles on factors of significance in record match processing. It examines LCCNs and OCLC numbers.
Most libraries rely on external service providers for match processing. In order to remain competitive, service providers must limit the amount of human assessment and review involved in processing.
Aside from the integrity of the numbers, success in match processing using OCLC number and/or LCCNs requires the accurate description of the format in which the numbers have been recorded and their location in the records to be processed.
The CFI/ORF grant provides resources for the researchers to match processing
standards set by those industries.
For instance, all records in an unprocessed file of OCLC subscription records will contain OCLC control numbers; this may not be the case if records from OCLC are loaded to a local automated library system and later downloaded for match processing. Depending on the options supported by the local system and the choices implemented in the installation, the OCLC numbers once present in the records might not be retained and/or output when the records are downloaded.
An observer can more readily assess the quality of match processing in matching and combination projects than in applications such as record upgrades or enhancements.
While both can contribute to the evaluation of match processing techniques and service, neither experience nor the hands-on inspection of processing output are definitive.
Cancelled/invalid ISBNss are rarely accessed in match processing.) Multiple 020 fields are used to accommodate multiple ISBNs in a single bibliographic record; the format does not support the recording of multiple ISBNs in a single $a subfield, nor allow multiple $a subfields in a single 020 field.
Unlike match processing based on ISBNs, the presence of non-matching ISSNs--ISSN conflict--in a pair of records should prevent a match being registered.
This option is rarely exercised in match processing. The ISSN field is currently valid only in records for serials and computer files.