[OPEN-ILS-DEV] ***SPAM*** [PATCH] add stylesheet to expand MARC21 880 fields

[Mike Rylander]

On Tue, Jun 8, 2010 at 7:13 AM, Galen Charlton <gmc at esilibrary.com> wrote:
> Hi,
>
> On Jun 7, 2010, at 11:16 PM, Mike Rylander wrote:
>> ISTM the same could be achieved without the cost of an XSLT with
>>
>> //marc:datafield[@tag='245' or (@tag='880' and
>> starts-with(./marc:subfield[@code='6']/text(),
>> '245'))]/marc:subfield[@code='a']
>>
>> I could certainly be missing something, though.
>
> Indeed it could, but using the XSLT allows the XPath to be more concise without having to make the user worry about 880 fields beyond remembering to set format to 'marc21expand880'.  In the particular database that inspired this patch, where for at least the first pass the indexing is based on a direct mapping of MARC subfields to index names per the legacy ILS's definitions, there are about 180 MARC tags involved spread among 12 indexes.  The time required to create such indexes during ingest wasn't noticeably longer that that required for the MODS-based indexes.
>

I wouldn't expect it to be slower, so that's good confirmation, but I
would expect the pure (if somewhat more complicated) raw marcxml XPath
to be noticeably faster.  A test of that would be useful information,
but not critical to the decision for core inclusion IMO.

That being said, I agree that's a reasonable tradeoff to give users --
(potentially ... until tested) better batch ingest speed (I'm not
concerned much with per-record costs of XSLT) vs simplified
configuration.

I'll commit to trunk soon.  Thanks!

-- 
Mike Rylander
 | VP, Research and Design
 | Equinox Software, Inc. / The Evergreen Experts
 | phone:  1-877-OPEN-ILS (673-6457)
 | email:  miker at esilibrary.com
 | web:  http://www.esilibrary.com