[OPEN-ILS-GENERAL] marc overlays

[Anne Murray]

That's very useful - thanks for that!

Anne


On 10 January 2013 14:16, Bill Erickson <berick at esilibrary.com> wrote:

>
> On Wed, Jan 9, 2013 at 11:08 AM, Anne Murray <anne.hamilton4 at ntlworld.com>wrote:
>
>> I am trying to overlay full marc records for DVDs on to a short record.
>> The short record has the UPC in field 020 and the proper record has it in
>> field 024. Is it possible to write a match set that will overlay this, or
>> is it the case that only 020 can overwrite 020 and nothing else?
>>
>
> Hi Anne,
>
> Out of the box, this is not possible, since match sets are designed to
> compare apples to apples.  However, and this is a long shot, with some
> configuration and record re-indexing it may be possible, given the right
> kind of data.
>
> You would have to create a new record attribute definition (admin ->
> server admin -> marc record attributes) to extract values from both 020 and
> 024 fields using XPATH.
>
> E.g.
>
> name = isbn-or-upc
> format = marcxml
> xpath = //marc:datafield[@tag='020' or @tag='024']/marc:subfield[@code='a'
> or @code='z']
> (change to suit)
>
> After this, you would have to re-index your bib records (or optionally
> update the values for this specific record attribute).
>
> When building your match set, you would add a match for your new
> isbn-or-upc record attribute instead of using 020 or 024 directly.  The
> match set will then compare the values of both fields combined.  I'm fairly
> certain this will only work, though, if the records that should match
> contain exactly one value for either 020 or 024 and not both or multiples
> of each.  The combined values of both fields across both records have to
> match.  This is may be too rigid for your use case.
>
> Hope this helps.
>
> -b
>
> --
> Bill Erickson
> | Senior Software Developer
> | phone: 877-OPEN-ILS (673-6457)
> | email: berick at esilibrary.com
> | web: http://esilibrary.com
> | Equinox Software, Inc. / Your Library's Guide to Open Source
>
>
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