Library of Congress Linked Data Service

Owner	Library of Congress
URL	id.loc.gov
Commercial	No
Content license	Public domain
Written in	Python
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The LC Linked Data Service is an initiative of the Library of Congress that publishes authority data as linked data.^[1] It is commonly referred to by its URI: id.loc.gov.^[2]

The first offering of the LC Linked Data Service was the Library of Congress Subject Headings (LCSH) dataset, which was released in April 2009.^[3]

Datasets

Library of Congress Subject Headings (LCSH)
Library of Congress Name Authority File (LCNAF)
Library of Congress Classification—because LC Classification uses a different MARC format than LC Authorities, mapping LC Classification to MADS/RDF was more difficult than mapping LCSH or LCNAF.^[2]
Library of Congress Thesaurus for Graphic Materials
Various MARC codes
Various preservation vocabularies

Formats

The service presents data in MADS/RDF and SKOS where appropriate, but also uses its own ontology to describe classification resources and relationships more accurately.^[2] All records are available individually via content negotiation as XHTML/RDFa, RDF/XML, N-Triples, and JSON.^[4]

Each vocabulary is also available to download in its entirety. Id.loc.gov does not currently provide a SPARQL endpoint.^[5]^[6]

Uses

All of LCSH are crosslinked with RAMEAU [d] (Répertoire d’autorité-matière encyclopédique et alphabétique unifié), an authority file from the Bibliothèque nationale de France.^[4]

Technical aspects

The id.loc.gov site initially used a fairly lightweight Python program to serve linked data.^[5]

References

^ "About". LC Linked Data Service. Library of Congress. Retrieved 2014-06-01.
^ ^a ^b ^c Ford, Kevin (January 2013). "Library of Congress Classification as linked data". JLIS.it. 4 (1). doi:10.4403/jlis.it-5465. Retrieved 2014-06-01.
^ Guenther, Rebecca (2011-01-09). LC's Authorities and Vocabularies Web Service: experimenting with Linked Data (PDF). American Library Association Mid-Winter Conference. San Diego, California, US. Retrieved 2014-06-01.
^ ^a ^b Ford, Kevin (2010-11-02). ID.LOC.GOV, 1 ½ Years: Review, Changes, Future Plans, MADS/RDF (PDF). Digital Library Federation Fall Forum. Palo Alto, California, US. Retrieved 2014-06-01.
^ ^a ^b Summers, Ed; Isaac, Antoine; Redding, Clay; Krech, Dan; Schreiber, Guus; Summers, Ed (2008). "LCSH, SKOS and Linked Data". Web Semantics: Science, Services and Agents on the World Wide Web. 20 (May 2013): 35–49. arXiv:0805.2855. doi:10.1016/j.websem.2013.05.001. S2CID 2266021. (NB. This appears to be two sources mixed up.)
^ "Technical Center". LC Linked Data Service. Retrieved 2014-06-01.

External links

Official website

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[lclds-1] "About". LC Linked Data Service. Library of Congress. Retrieved 2014-06-01.

[Ford_2013-2] Ford, Kevin (January 2013). "Library of Congress Classification as linked data". JLIS.it. 4 (1). doi:10.4403/jlis.it-5465. Retrieved 2014-06-01.

[Guenther_2011-3] Guenther, Rebecca (2011-01-09). LC's Authorities and Vocabularies Web Service: experimenting with Linked Data (PDF). American Library Association Mid-Winter Conference. San Diego, California, US. Retrieved 2014-06-01.

[Ford_2010-4] Ford, Kevin (2010-11-02). ID.LOC.GOV, 1 ½ Years: Review, Changes, Future Plans, MADS/RDF (PDF). Digital Library Federation Fall Forum. Palo Alto, California, US. Retrieved 2014-06-01.

[Summers_2013-5] Summers, Ed; Isaac, Antoine; Redding, Clay; Krech, Dan; Schreiber, Guus; Summers, Ed (2008). "LCSH, SKOS and Linked Data". Web Semantics: Science, Services and Agents on the World Wide Web. 20 (May 2013): 35–49. arXiv:0805.2855. doi:10.1016/j.websem.2013.05.001. S2CID 2266021. (NB. This appears to be two sources mixed up.)

[TC-6] "Technical Center". LC Linked Data Service. Retrieved 2014-06-01.

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