[Enhance] LC records overlaying OCLC master records

[Greene,Richard]

I'm working thiis week on identifying changes to the software that
merges data and I'll add these to the list of fields to consider.

Rich 

-----Original Message-----
From: D. Brooking [mailto:dbrookin at u.washington.edu] 
Sent: Monday, October 20, 2008 4:55 PM
To: Greene,Richard
Cc: OCLC Enhance Libraries
Subject: RE: [Enhance] LC records overlaying OCLC master records

Richard,

I was just looking at a record I asked LC to correct. (#69594228). 
Cyrillic was retained, as well as the 546 and 041 that I added.

BUT -- the 040 $b eng and the 936  PR 163640087 were wiped out by the
overlay process. You might want to consider protecting those fields as
well as part of the parallel record scheme??




************
Diana Brooking             (206) 685-0389
Cataloging Librarian       (206) 685-8782 fax
Suzzallo Library           dbrookin at u.washington.edu
University of Washington
Box 352900
Seattle WA  98195-2900

On Fri, 17 Oct 2008, Greene,Richard wrote:


> The software that merges data and chooses which data to retain when an



> LC record overlays an existing record is quite complex.  It is 

> designed to retain useful unique data from both records and the most 

> authoritative data possible, whenever that can be determined.  Due to 

> differences in cataloging practices, tagging, etc., the results are 

> not always what we expect but we are always looking for improvement.

> Software will not always determine the best data and most useful data 

> in the same way as a human would.

>

> You are correct about the non-Roman data.  We try to match up 

> non-Roman data to the corresponding roman-only field and link and 

> retain both of them.  If we find non-Roman fields that we cannot link 

> to a roman-only field, we usually merge it to the record with the 

> expectation that a user will find the record and link the fields

correctly.

>

> We have also taken steps to preserve series work as performed by our 

> users.  Tag 440 field will always be retained over tag 490 if the 

> contents are the same, even when an LC record replaces an existing 

> record.  We do not want to lose the information related to tracing.

>

> Each tag that is considered for merging from one record to another has



> its own set of rules.  The general rule is that, if the data is not 

> present in the record that will be kept, it will be merged from the 

> record being replaced.  Examples of this might be contents notes, call



> numbers, and subject headings.  In the latter instance, we retain all 

> subject headings that are in a scheme not found in the retained

record.

> For example, if an LC record contains LC subject headings and matches 

> to a record that contains only Sears headings, the resulting WorldCat 

> record will contain the LC subject headings assigned by LC and the 

> Sears headings already in the record.  For additional information 

> about the fields that automatically transfer, see the Enhance Training



> Outline

> (http://www.oclc.org/support/training/worldcat/enhanceoutline/) in 

> "Requirements, policies, and practices," Section E. Bibliographic 

> Duplicates, Number 6.

>

>

> Unfortunately, the software will not always retain the most accurate 

> and up to date information.  If you have corrected a typographical 

> error in a record and the new version of the LC record has the same 

> typo, the software will put the error back into WorldCat and your 

> correction will be lost.  However, if you are adding information that 

> improves access, such as call numbers, non-LC subject headings, 

> geographic area codes, contents notes, etc., there is a good 

> possibility that your enhancements will be retained in the new record.

>

> Rich Greene

> OCLC, Inc.

> 6565 Kilgour Place

> Dublin, OH 43017

> 614-764-6154

> email:  richard_greene at oclc.org

>

> -----Original Message-----

> From: enhance-bounces at mailman1.u.washington.edu

> [mailto:enhance-bounces at mailman1.u.washington.edu] On Behalf Of D.

> Brooking

> Sent: Thursday, October 16, 2008 6:46 PM

> To: enhance at u.washington.edu

> Subject: [Enhance] LC records overlaying OCLC master records

>

>

> Dear Enhancers,

>

> I need to have a review of what could happen should LC make any 

> changes to a record that would then get redistributed, including to 

> OCLC. Which if any fields are protected from overlay in OCLC?

>

> I am concerned because we are increasingly making enhancements and 

> corrections to LC records in the area of international studies, 

> changes that don't result in a change in encoding level.

>

> I seem to remember that non-Roman fields that LC lacks will not get 

> wiped out, and that some kind of series protection is now there so 

> series don't all revert back to 490s. But what about other things? LC 

> records are treated differently than all others, but I am not sure 

> this makes sense any longer in the new "network-level" environment we 

> are trying to build.

>

>

> ************

> Diana Brooking             (206) 685-0389

> Cataloging Librarian       (206) 685-8782 fax

> Suzzallo Library           dbrookin at u.washington.edu

> University of Washington

> Box 352900

> Seattle WA  98195-2900

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> Enhance mailing list

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