When I did a project converting records from UKMARC -> MARC21 we kept the UKMARC records for a period (about 5 years I think) while we assured ourselves that we hadn't missed anything vital. We did occasionally refer back to the older record to check things, but having not found any major issues with the conversion after that period we felt confident disposing of the record. This is the type of usage I was imagining for a copy of the MARC record in this scenario.
Owen
Owen Stephens
Owen Stephens Consulting
Web: http://www.ostephens.com
Email: [log in to unmask]
Telephone: 0121 288 6936
On 7 Dec 2011, at 01:52, Montoya, Gabriela wrote:
> One critical thing to consider with MARC records (or any metadata, for that matter) is that it they are not stagnant, so what is the value of storing entire record strings into one triple if we know that metadata is volatile? As an example, UCSD has over 200,000 art images that had their metadata records ingested into our local DAMS over five years ago. Since then, many of these records have been edited/massaged in our OPAC (and ARTstor), but these updated records have not been refreshed in our DAMS. Now we find ourselves needing to desperately have the "What is our database of record?" conversation.
>
> I'd much rather see resources invested in data synching than spending it in saving text dumps that will most likely not be referred to again.
>
> Dream Team for Building a MARC > RDF Model: Karen Coyle, Alistair Miles, Diane Hillman, Ed Summers, Bradley Westbrook.
>
> Gabriela
>
> -----Original Message-----
> From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Karen Coyle
> Sent: Tuesday, December 06, 2011 7:44 AM
> To: [log in to unmask]
> Subject: Re: [CODE4LIB] Models of MARC in RDF
>
> Quoting "Fleming, Declan" <[log in to unmask]>:
>
>> Hi - I'll note that the mapping decisions were made by our metadata
>> services (then Cataloging) group, not by the tech folks making it all
>> work, though we were all involved in the discussions. One idea that
>> came up was to do a, perhaps, lossy translation, but also stuff one
>> triple with a text dump of the whole MARC record just in case we
>> needed to grab some other element out we might need. We didn't do
>> that, but I still like the idea. Ok, it was my idea. ;)
>
> I like that idea! Now that "disk space" is no longer an issue, it makes good sense to keep around the "original state" of any data that you transform, just in case you change your mind. I hadn't thought about incorporating the entire MARC record string in the transformation, but as I recall the average size of a MARC record is somewhere around 1K, which really isn't all that much by today's standards.
>
> (As an old-timer, I remember running the entire Univ. of California union catalog on 35 megabytes, something that would now be considered a smallish email attachment.)
>
> kc
>
>>
>> D
>>
>> -----Original Message-----
>> From: Code for Libraries [mailto:[log in to unmask]] On Behalf
>> Of Esme Cowles
>> Sent: Monday, December 05, 2011 11:22 AM
>> To: [log in to unmask]
>> Subject: Re: [CODE4LIB] Models of MARC in RDF
>>
>> I looked into this a little more closely, and it turns out it's a
>> little more complicated than I remembered. We built support for
>> transforming to MODS using the MODS21slim2MODS.xsl stylesheet, but
>> don't use that. Instead, we use custom Java code to do the mapping.
>>
>> I don't have a lot of public examples, but there's at least one public
>> object which you can view the MARC from our OPAC:
>>
>> http://roger.ucsd.edu/search/.b4827884/.b4827884/1,1,1,B/detlmarc~1234
>> 567&FF=&1,0,
>>
>> The public display in our digital collections site:
>>
>> http://libraries.ucsd.edu/ark:/20775/bb0648473d
>>
>> The RDF for the MODS looks like:
>>
>> <mods:classification rdf:parseType="Resource">
>> <mods:authority>local</mods:authority>
>> <rdf:value>FVLP 222-1</rdf:value>
>> </mods:classification>
>> <mods:identifier rdf:parseType="Resource">
>> <mods:type>ARK</mods:type>
>>
>> <rdf:value>http://libraries.ucsd.edu/ark:/20775/bb0648473d</rdf:value>
>> </mods:identifier>
>> <mods:name rdf:parseType="Resource">
>> <mods:namePart>Brown, Victor W</mods:namePart>
>> <mods:type>personal</mods:type>
>> </mods:name>
>> <mods:name rdf:parseType="Resource">
>> <mods:namePart>Amateur Film Club of San Diego</mods:namePart>
>> <mods:type>corporate</mods:type>
>> </mods:name>
>> <mods:originInfo rdf:parseType="Resource">
>> <mods:dateCreated>[196-]</mods:dateCreated>
>> </mods:originInfo>
>> <mods:originInfo rdf:parseType="Resource">
>> <mods:dateIssued>2005</mods:dateIssued>
>> <mods:publisher>Film and Video Library, University of
>> California, San Diego, La Jolla, CA 92093-0175
>> http://orpheus.ucsd.edu/fvl/FVLPAGE.HTM</mods:publisher>
>> </mods:originInfo>
>> <mods:physicalDescription rdf:parseType="Resource">
>> <mods:digitalOrigin>reformatted digital</mods:digitalOrigin>
>> <mods:note>16mm; 1 film reel (25 min.) :; sd., col. ;</mods:note>
>> </mods:physicalDescription>
>> <mods:subject rdf:parseType="Resource">
>> <mods:authority>lcsh</mods:authority>
>> <mods:topic>Ranching</mods:topic>
>> </mods:subject>
>>
>> etc.
>>
>>
>> There is definitely some loss in the conversion process -- I don't
>> know enough about the MARC leader and control fields to know if they
>> are captured in the MODS and/or RDF in some way. But there are
>> quite a few local and note fields that aren't present in the RDF.
>> Other fields (e.g. 300 and 505) are mapped to MODS, but not displayed
>> in our access system (though they are indexed for searching).
>>
>> I agree it's hard to quantify lossy-ness. Counting fields or
>> characters would be the most objective, but has obvious problems with
>> control characters sometimes containing a lot of information, and then
>> the relative importance of different fields to the overall
>> description. There are other issues too -- some fields in this record
>> weren't migrated because they duplicated collection-wide values, which
>> are formulated slightly differently from the MARC record. Some fields
>> weren't migrated because they concern the physical object, and
>> therefore don't really apply to the digital object. So that really
>> seems like a morass to me.
>>
>> -Esme
>> --
>> Esme Cowles <[log in to unmask]>
>>
>> "Necessity is the plea for every infringement of human freedom. It is
>> the argument of tyrants; it is the creed of slaves." -- William Pitt,
>> 1783
>>
>> On 12/3/2011, at 10:35 AM, Karen Coyle wrote:
>>
>>> Esme, let me second Owen's enthusiasm for more detail if you can
>>> supply it. I think we also need to start putting these efforts along
>>> a "loss" continuum - MODS is already lossy vis-a-vis MARC, and my
>>> guess is that some of the other MARC->RDF transforms don't include
>>> all of the warts and wrinkles of MARC. LC's new bibliographic
>>> framework document sets as a goal to bring along ALL of MARC (a
>>> decision that I think isn't obvious, as we have already discussed
>>> here). If we say we are going from MARC to RDF, how much is actually
>>> captured in the transformed data set? (Yes, that's going to be hard
>>> to quantify.)
>>>
>>> kc
>>>
>>> Quoting Esme Cowles <[log in to unmask]>:
>>>
>>>> Owen-
>>>>
>>>> Another strategy for capturing MARC data in RDF is to convert it to
>>>> MODS (we do this using the LoC MARC to MODS stylesheet:
>>>> http://www.loc.gov/standards/marcxml/xslt/MARC21slim2MODS.xsl).
>>>> From there, it's pretty easy to incorporate into RDF. There are
>>>> some issues to be aware of, such as how to map the MODS XML names to
>>>> predicates and how to handle elements that can appear in multiple
>>>> places in the hierarchy.
>>>>
>>>> -Esme
>>>> --
>>>> Esme Cowles <[log in to unmask]>
>>>>
>>>> "Necessity is the plea for every infringement of human freedom. It
>>>> is the argument of tyrants; it is the creed of slaves." -- William
>>>> Pitt,
>>>> 1783
>>>>
>>>> On 11/28/2011, at 8:25 AM, Owen Stephens wrote:
>>>>
>>>>> It would be great to start collecting transforms together - just a
>>>>> quick brain dump of some I'm aware of
>>>>>
>>>>> MARC21 transformations
>>>>> Cambridge University Library - http://data.lib.cam.ac.uk -
>>>>> transformation made available (in code) from same site Open
>>>>> University - http://data.open.ac.uk - specific transform for
>>>>> materials related to teaching, code available at
>>>>> http://code.google.com/p/luceroproject/source/browse/trunk%20lucero
>>>>> p
>>>>> roject/OULinkedData/src/uk/ac/open/kmi/lucero/rdfextractor/RDFExtra
>>>>> c tor.java (MARC transform is in libraryRDFExtraction method) COPAC
>>>>> - small set of records from the COPAC Union catalogue - data and
>>>>> transform not yet published Podes Projekt - LinkedAuthors -
>>>>> documentation at
>>>>> http://bibpode.no/linkedauthors/doc/Pode-LinkedAuthors-Documentatio
>>>>> n .pdf - 2 stage transformation firstly from MARC to FRBRized
>>>>> version of data, then from FRBRized data to RDF. These linked from
>>>>> documentation Podes Project - LinkedNonFiction - documentation at
>>>>> http://bibpode.no/linkednonfiction/doc/Pode-LinkedNonFiction-Docume
>>>>> n tation.pdf - MARC data transformed using xslt
>>>>> https://github.com/pode/LinkedNonFiction/blob/master/marcslim2n3.xs
>>>>> l
>>>>>
>>>>> British Library British National Bibliography -
>>>>> http://www.bl.uk/bibliographic/datafree.html - data model
>>>>> documented, but no code available Libris.se - some notes in various
>>>>> presentations/blogposts (e.g.
>>>>> http://dc2008.de/wp-content/uploads/2008/09/malmsten.pdf) but can't
>>>>> find explicit transformation Hungarian National library -
>>>>> http://thedatahub.org/dataset/hungarian-national-library-catalog
>>>>> and http://nektar.oszk.hu/wiki/Semantic_web#Implementation - some
>>>>> information on ontologies used but no code or explicit
>>>>> transformation (not 100% sure this is from MARC) Talis -
>>>>> implemented in several live catalogues including
>>>>> http://catalogue.library.manchester.ac.uk/ - no documentation or
>>>>> code afaik although some notes in
>>>>>
>>>>> MAB transformation
>>>>> HBZ - some of the transformation documented at
>>>>> https://wiki1.hbz-nrw.de/display/SEM/Converting+the+Open+Data+from+
>>>>> the+hbz+to+BIBO, don't think any code published?
>>>>>
>>>>> Would be really helpful if more projects published their
>>>>> transformations (or someone told me where to look!)
>>>>>
>>>>> Owen
>>>>>
>>>>> Owen Stephens
>>>>> Owen Stephens Consulting
>>>>> Web: http://www.ostephens.com
>>>>> Email: [log in to unmask]
>>>>> Telephone: 0121 288 6936
>>>>>
>>>>> On 26 Nov 2011, at 15:58, Karen Coyle wrote:
>>>>>
>>>>>> A few of the code4lib talk proposals mention projects that have or
>>>>>> will transform MARC records into RDF. If any of you have
>>>>>> documentation and/or examples of this, I would be very interested
>>>>>> to see them, even if they are "under construction."
>>>>>>
>>>>>> Thanks,
>>>>>> kc
>>>>>>
>>>>>> --
>>>>>> Karen Coyle
>>>>>> [log in to unmask] http://kcoyle.net
>>>>>> ph: 1-510-540-7596
>>>>>> m: 1-510-435-8234
>>>>>> skype: kcoylenet
>>>>
>>>
>>>
>>>
>>> --
>>> Karen Coyle
>>> [log in to unmask] http://kcoyle.net
>>> ph: 1-510-540-7596
>>> m: 1-510-435-8234
>>> skype: kcoylenet
>>
>
>
>
> --
> Karen Coyle
> [log in to unmask] http://kcoyle.net
> ph: 1-510-540-7596
> m: 1-510-435-8234
> skype: kcoylenet
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