Library of Congress Linked Data Service

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:[2]

Library of Congress Linked Data Service
OwnerLibrary of Congress
Content license
Public domain
Written inPython

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]



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. does not currently provide a SPARQL endpoint.[5][6]


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

Technical aspects

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

See also


  1. "About". LC Linked Data Service. Library of Congress. Retrieved 1 June 2014.
  2. Ford, Kevin (January 2013). "Library of Congress Classification as linked data". (Italian Journal of Library & Information Science). 4 (1). doi:10.4403/ Retrieved 1 June 2014.
  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, CA. Retrieved 1 June 2014.
  4. Ford, Kevin (2 November 2010). ID.LOC.GOV, 1 ½ Years: Review, Changes, Future Plans, MADS/RDF (PDF). Digital Library Federation Fall Forum. Palo Alto, CA. Retrieved 1 June 2014.
  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 (2013): 35–49. arXiv:0805.2855. doi:10.1016/j.websem.2013.05.001.
  6. "Technical Center". LC Linked Data Service. Retrieved 1 June 2014.

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