View source for Library of Congress Linked Data Service

{{use dmy dates|date=July 2021|cs1-dates=y}}
{{Infobox website
| name               = Library of Congress Linked Data Service
| url                = {{URL|https://id.loc.gov}}
| commercial         = No
| content_license    = [[Public domain]]
| programming_language = [[Python (programming language)|Python]]
| owner              = [[Library of Congress]]
| alexa              =
}}
The '''LC Linked Data Service''' is an initiative of the [[Library of Congress]] that publishes [[Authority control|authority data]] as [[linked data]].<ref name="lclds"/>
It is commonly referred to by its URI: id.loc.gov.<ref name="Ford_2013"/>
The first offering of the LC Linked Data Service was the [[Library of Congress Subject Headings]] (LCSH) dataset, which was released in April 2009.<ref name="Guenther_2011"/>
==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 standards|MARC]] format than LC Authorities, mapping LC Classification to MADS/RDF was more difficult than mapping LCSH or LCNAF.<ref name="Ford_2013"/>
* Library of Congress Thesaurus for Graphic Materials
* Various [[MARC standards|MARC]] codes
* Various [[Preservation (library and archival science)|preservation]] vocabularies
===Formats===
The service presents data in [[Metadata Authority Description Schema|MADS/RDF]] and [[SKOS]] where appropriate, but also uses its own ontology to describe classification resources and relationships more accurately.<ref name="Ford_2013"/>  All records are available individually via [[content negotiation]] as [[RDFa|XHTML/RDFa]], [[RDF/XML]], [[N-Triples]], and [[JSON]].<ref name="Ford_2010"/>
Each vocabulary is also available to download in its entirety. Id.loc.gov does not currently provide a [[SPARQL]] endpoint.<ref name="Summers_2013"/><ref name="TC"/>
==Uses==
All of LCSH are crosslinked with {{ill|RAMEAU|d|Q13421502}} ({{lang|fr|Répertoire d’autorité-matière encyclopédique et alphabétique unifié}}), an authority file from the [[Bibliothèque nationale de France]].<ref name="Ford_2010"/>
==Technical aspects==
The id.loc.gov site initially used a fairly lightweight [[Python (programming language)|Python]] program to serve linked data.<ref name="Summers_2013"/>
==See also==
* [[Authority control]]
* [[BIBFRAME]]
* {{lang|de|[[Personennamendatei]]}} (PND)
* [[Virtual International Authority File]] (VIAF)
==References==
{{reflist|refs=
<ref name="Ford_2013">{{cite journal |author-last=Ford |author-first=Kevin |title=Library of Congress Classification as linked data |journal=JLIS.it |date=January 2013 |volume=4 |issue=1 |doi=10.4403/jlis.it-5465 |url=http://leo.cilea.it/index.php/jlis/article/download/5465/7863 |access-date=2014-06-01}}</ref>
<ref name="Ford_2010">{{cite conference |author-last=Ford |author-first=Kevin |title=ID.LOC.GOV, 1 ½ Years: Review, Changes, Future Plans, MADS/RDF |url=https://id.loc.gov/static/presentations/kefo_dlf_id.pdf |conference=Digital Library Federation Fall Forum |access-date=2014-06-01 |location=Palo Alto, California, US |date=2010-11-02}}</ref>
<ref name="Summers_2013">{{cite journal |title=LCSH, SKOS and Linked Data |last1=Summers |first1=Ed |last2=Isaac |first2=Antoine |last3=Redding |first3=Clay |last4=Krech |first4=Dan |last5=Schreiber |first5=Guus |last6=Summers |first6=Ed |journal=Web Semantics: Science, Services and Agents on the World Wide Web |volume=20 |arxiv=0805.2855 |pages=35–49 |issue=May 2013 |date=2008 |doi=10.1016/j.websem.2013.05.001|s2cid=2266021 }} (NB. This appears to be two sources mixed up.)</ref>
<ref name="lclds">{{cite web |title=About |url=https://id.loc.gov/about/ |website=LC Linked Data Service |publisher=[[Library of Congress]] |access-date=2014-06-01}}</ref>
<ref name="Guenther_2011">{{cite conference |author-last=Guenther |author-first=Rebecca |title=LC's Authorities and Vocabularies Web Service: experimenting with Linked Data |url=https://id.loc.gov/static/presentations/rgue-controlledvocabs-ala-mw2011-1.pdf |conference=American Library Association Mid-Winter Conference |access-date=1 June 2014 |location=San Diego, California, US |date=2011-01-09}}</ref>
<ref name="TC">{{cite web |title=Technical Center |url=https://id.loc.gov/techcenter/searching.html |website=LC Linked Data Service |access-date=2014-06-01}}</ref>
}}
==External links==
* [https://id.loc.gov LC Linked Data Service]
[[Category:Semantic Web]]
[[Category:Knowledge bases]]
[[Category:Library of Congress|Linked Data Service]]
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