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Re: Library of Congress Subject Headings as SKOS Linked Data

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Mon, 09 Jun 2008 10:26:42 -0400
Message-ID: <484D3DA2.50007@openlinksw.com>
To: "Hausenblas, Michael" <michael.hausenblas@joanneum.at>
CC: Ed Summers <ehs@pobox.com>, SWD Working SWD <public-swd-wg@w3.org>, public-lod@w3.org

Hausenblas, Michael wrote:
> Ed,
> Congrats! Very, very impressive usage of both linked data and RDFa ;)
> Especially your 'GRDDL stuff' in the header should be used in 'good
> practice' somewhere on SWD or LOD I think.


In an earlier thread re. ESW 2008 Playground I stated that at least one 
of the following (where feasible) should be standard practice re. 
adherence to Linked Data Deplyment tenets:
1. Handling Content Negotiation requests
2. <link rel=-"alternate"..../>  (when HTML is requested)
3. GRDDL profile in <head/> plus <link rel="transformation".../>  (when 
(X)HTML or  XML is requested)
4. eRDF or RDFa (when HTML or (X)HTML is requested)

The above makes the assumption that derferencable URIs are used in the 
RDF Data Sources that are being deployed into the Web.

This is how the Linked Data Web matrializes within the existing Web, 
unobtrusively (imho).

Ed: We will load you stuff into a Virtuoso instance latter today, and 
point you to a public SPARQL endpoint etc..  Our ultimate goal is the 
expose the entire LOD Linked Data Space via a SPARQL endpoint via EC2 
instances such that anyone can enable and disable these sparql endpoints 
in the Clouds without the traditional overhead of data loading, 
indexing, and platform tunning. We just want LOD exploiters to click go, 
and that's it.

> Cheers,
> 	Michael
> ----------------------------------------------------------
>  Michael Hausenblas, MSc.
>  Institute of Information Systems & Information Management
>  JOANNEUM RESEARCH Forschungsgesellschaft mbH
>  http://www.joanneum.at/iis/
> ----------------------------------------------------------
>> -----Original Message-----
>> From: public-swd-wg-request@w3.org 
>> [mailto:public-swd-wg-request@w3.org] On Behalf Of Ed Summers
>> Sent: Monday, June 09, 2008 3:54 PM
>> To: SWD Working SWD; public-lod@w3.org
>> Subject: Library of Congress Subject Headings as SKOS Linked Data
>> I'd like to announce an experimental linked-data, SKOS representation
>> of the Library of Congress Subject Headings (LCSH) [1] ... and also
>> ask for some help.
>> The Library of Congress has been participating in the W3C Semantic Web
>> Deployment Working Group, and has converted LCSH from the MARC21 data
>> format [2] to SKOS. LCSH is a controlled vocabulary used to index
>> materials that have been added to the collections at the Library of
>> Congress. It has been in active development since 1898, and was first
>> published in 1914 so that other libraries and bibliographic utilities
>> could use and adapt it. The lcsh.info service makes 266,857 subject
>> headings available as SKOS concepts, which amounts to 2,441,494
>> triples that are separately downloadable [3] (since there isn't a
>> SPARQL endpoint just yet).
>> At the last SWDWG telecon some questions came up about the way
>> concepts are identified, and made available via HTTP. Since we're
>> hoping lcsh.info can serve as an implementation of SKOS for the W3C
>> recommendation process we want to make sure we do this right. So I was
>> hoping interested members of the linked-data and SKOS communities
>> could take a look and make sure the implementation looks correct.
>> Each concept is identified with a URI like:
>>  http://lcsh.info/sh95000541#concept
>> When responding to requests for concept URIs, the server content
>> negotiates to determine which representation of the concept to return:
>>  - application/xhtml+xml
>>  - application/json
>>  - text/n3
>>  - application/rdf+xml
>> This is basically the pattern that Cool URIs for the Semantic Web
>> discusses as the Hash URI with Content Negotiation [4]. An additional
>> point that is worth mentioning is that the XHTML representation
>> includes RDFa, that also describes the concept.
>> At the moment the LCSH/SKOS data is only linked to itself, through
>> assertions that involve skos:broader, skos:narrower, and skos:related.
>> But the hope is that minting URIs for LCSH will allow it to be mapped
>> and/or linked to concepts in other vocabularies: dbpedia, geonames,
>> etc.
>> Any feedback, criticisms, ideas are welcome either on either the
>> public-lod [5] or public-swd-wg [6] discussion lists.
>> Thanks for reading this far!
>> //Ed
>> [1] http://lcsh.info
>> [2] http://www.loc.gov/marc/
>> [3] http://lcsh.info/static/lcsh.nt
>> [4] http://www.w3.org/TR/cooluris/#hashuri
>> [5] http://lists.w3.org/Archives/Public/public-lod/
>> [6] http://lists.w3.org/Archives/Public/public-swd-wg/



Kingsley Idehen	      Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO 
OpenLink Software     Web: http://www.openlinksw.com
Received on Monday, 9 June 2008 14:27:33 UTC

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