Introduction
This poster presents a linked data representation of the National Library of Latvia (NLL) authority data consisting of topical, geographic name and form/genre thesauri.
- Paper (PDF): National Library of Latvia Subject Headings as Linked Open Data
- NLL Ontology service containing the datasets: https://dati.lnb.lv/onto/lv/
- Video (Youtube)
Process
The process for converting MARC 21 authority records to linked data consists of the following steps:
- Enriching MARC 21 records with links to external data sources.
- Converting MARC records to SKOS concepts using mc2skos.
- Publishing SKOS datasets as linked open data using Skosmos.
The resulting NLL linked open authority data can be browsed in the Skosmos user interface and is available via Skosmos REST API and as linked data by looking up thesaurus concept URIs.
Linked Datasets
The NLL linked open datasets published this way include:
- Topical names (44'407 concepts):
- 85% contain links to the Library of Congress Subject Headings (LCSH)
- Geographic names (9'671 concepts) containing links to:
- Place Names Database of Latvia (11% of concepts)
- Wikidata (5.3%)
- Virtual International Authority File dataset (3.5% of concepts)
- Form / genre terms (1'662 concepts) containing links to:
- FAST Linked Data dataset (21% of concepts)
- Czech National Authority Database (11.7%)
- Library of Congress Genre/Form dataset (8%)
The information listed here corresponds to the state of the datasets as of March 2021.
Example
This screenshot shows an example of a subject terms dataset concept "Ontologies (Information retrieval)".
The information shown in the screenshot includes:
- URI of the concept:
http://dati.lnb.lv/onto/subject/LNC10-000123185 - a link to the related LCSH concept: Ontologies (Information retrieval)
- the local identifier in the source information system (ExLibris Aleph) along with a link to the same concept in this information system (ALEPH authority record).
