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Previously, the only access to the vocabularies stored in NVS2.0 had been through a custom interface. The SPARQL end-point has the following advantages
- It makes collections (vocabularies) appear as databases and gives the user powerful query mechanisms
- It enables users to interrogate multiple collections (that include SPARQL end-point functionality) with one customised query
- Queries are unambiguous as they must conform to a World Wide Web Commission (W3C) standard
What are RDF triples?
Imagine a simple vocabulary that describes flower colour. Its contents could include: 'A buttercup has the colour yellow', A daffodil has the colour yellow', 'A tulip has the colour yellow','A tulip has the colour red', 'A tulip has the colour orange', 'A tulip has the colour pink'.
Where 'A buttercup has the colour yellow' in RDF is the triple; 'A buttercup', 'has the colour', 'yellow'.
Using SPARQL, you could easily identify those flowers that have the colour yellow or all the tulip colours. This could be federated to collate information from any 'flower colour' vocabulary with a SPARQL end-point.
The NERC Vocabulary Server
To ensure consistent metadata and data descriptions, the NERC Vocabulary Server (NVS2.0) provides access to the controlled vocabularies used by both BODC and the wider environmental science community. The vocabulary concepts are linked by mappings to provide RDF triples.