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CODE4LIB  March 2008

CODE4LIB March 2008

Subject:

Re: musing on oca apiRe: [CODE4LIB] oca api?

From:

Jonathan Rochkind <[log in to unmask]>

Reply-To:

Code for Libraries <[log in to unmask]>

Date:

Wed, 12 Mar 2008 17:36:30 -0400

Content-Type:

text/plain

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Parts/Attachments

text/plain (85 lines)

This is great stuff. I am interested in what algorithms you are using to
group works. It sounds like you are doing that, above what OCA does
(which is nothing, I think).  Have you gotten that far yet? What are you
thinking? Oh wait, you're from OCLC, you guys have already got all sorts
of stuff to do that, I guess.

Jonathan

Tim McCormick wrote:
> In our office we too have been investigating the e-book material at
> Internet Archive / OCA.
>
> We'd like to build just the sort of OCA index / id-switcher that Tim
> Shearer and others have described on this list -- in order to, among
> other things, add this type of capability to our xID (aka xISBN)
> service, and to WorldCat.
>
> So, I thought I'd report on results so far, and what we're working on.
>
> Data:
> 1) First, we used the Internet Archive's OAI interface to harvest
> brief records of all items categorized as "text".  We found that this
> yielded only very brief records, though -- author, title, and OCA
> unique identifier (e.g. "northcarolinayea1910rale").
> 2) Then we used the OCA identifier to check for, and harvest, MARC-XML
> records when available, using the lookup method described by Chris
> Freeland on Code4Lib on Feb 25.
> 3) The MARC files were examined for ISBNs and OCLCnums.  (yes, we may
> look for other identifiers later).
>
> That yielded:
>   - 290,756 total OCA "text" records found
>   - 198,826 of those had MARC records
>   - 1773 had ISBNs
>   - 88537 had OCLC numbers (identified by record position & format,
> but not yet verified against WorldCat).
>
> Switching:
> In xID we currently support ISBN, have recently added LCCN, and we
> plan to release ISSN and OCLCnum support in upcoming releases.  So,
> when those are fully phased in, the goal is that you could submit an
> identifier of any supported type, and get back all identifiers of
> whichever type that represent versions of the same "work";  or, when
> appropriate, the same manifestation.
>     Therefore, the 88.537 OCLCnums will likely map to a much larger
> set of identifiers over all, allowing a lot of book records -- in
> library catalogs or elsewhere -- to hook into OCA materials.
>
> Free-text service:
> We imagine a service which, given an identifier, attempts to decide if
> a free-text version of the described work is available at OCA/IA: and
> if so, returns an access URL for that resource.
>
> Other work:
> We are investigating the case of free/open resources that lack
> standard identifiers -- for example, possibly, the 2/3 of IA texts for
> which we didn't find OCLCnum or ISBN.  Here, we are looking at doing
> "best-guess" lookup of related identifiers, based on author and title
> information in the brief record.   This might allow substantially
> broader indexing of open content materials, but the reliability of the
> identifier association is lower.
>
> Any tips, questions, suggestions, requests are welcome.
> thanks to Xiaoming Liu and Tom Ventimiglia in OCLC New Jersey office
> for work on this.
>
> Tim
>
> --
> Tim McCormick
> Product Manager (xID), OCLC New Jersey
> Email: mccormit (at) oclc.org
> 2 Broad St., Suite 208, Bloomfield, New Jersey 07003 USA
> Phone: +1.973.868.5694  |  Skype:  tim_mccormick
> http://www.oclc.org/
>
>

--
Jonathan Rochkind
Digital Services Software Engineer
The Sheridan Libraries
Johns Hopkins University
410.516.8886
rochkind (at) jhu.edu

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