Hi, folks,
I am just back into the office from a workshop and wanted to add to this thread. As Declan noted, we at UC San Diego wrangle a lot of source metadata into RDF statements for our digital assets. MARC records form a goodly portion of the source metadata that we transform. We leave bits, sometime big bits, of the MARC record behind (we do not use 040, 041, 09x data in our DAMS), and we sometimes change some of the MARC data we do retain (300 extent statements are typically changed to reflect the digital object and no longer the analog object that was digitized). And we add technical and rights data to the RDF that does not appear at all in the source MARC record. The RDF we transform from MARC records does, however, carry one or more traces back to its source MARC record, often in the forms of a link to the record in our MARC catalog, the record identifier for that MARC record, and the OCLC record identifier.
Brad W.
-----Original Message-----
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Fleming, Declan
Sent: Tuesday, December 06, 2011 2:43 PM
To: [log in to unmask]
Subject: Re: [CODE4LIB] Models of MARC in RDF
Hi - point at it where? We could point back to the library catalog that we harvested in the MARC to MODS to RDF process, but what if that goes away? Why not write ourselves a 1K insurance policy that sticks with the object for its life?
D
-----Original Message-----
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Owen Stephens
Sent: Tuesday, December 06, 2011 8:06 AM
To: [log in to unmask]
Subject: Re: [CODE4LIB] Models of MARC in RDF
I'd suggest that rather than shove it in a triple it might be better to point at alternative representations, including MARC if desirable (keep meaning to blog some thoughts about progressively enhanced metadata...)
Owen
Owen Stephens
Owen Stephens Consulting
Web: http://www.ostephens.com
Email: [log in to unmask]
Telephone: 0121 288 6936
On 6 Dec 2011, at 15:44, Karen Coyle wrote:
> 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~123
>> 4567&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%20lucer
>>>>> op
>>>>> roject/OULinkedData/src/uk/ac/open/kmi/lucero/rdfextractor/RDFExtr
>>>>> ac 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-Documentati
>>>>> on .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-Docum
>>>>> en tation.pdf - MARC data transformed using xslt
>>>>> https://github.com/pode/LinkedNonFiction/blob/master/marcslim2n3.x
>>>>> sl
>>>>>
>>>>> 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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