EASY LOD

EASY metadata as Linked Open Data Demo

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EASY Metadata as Linked Open Data Demo

Motivation

Generate an RDF dump of EASY metadata.
Show off flexibility of SPARQL queries.
Investigate issues related to publishing metadata as LOD.

Status

This is a quick and dirty demo. Choices made are motivated by the speed of implementation, nothing is guaranteed to work, everything is likely to change.

Results

The dump of EASY metadata generated by the custom script is available via the public SPARQL endpoint.

You can use the following example queries as a starting point for exploration of the data:

You can generate a list of datasets geographically close to any given dataset containing geographical coordinates in metadata using EASYnear bookmarklet. Install the bookmarklet by dragging this link EASYnear to the bookmark bar in your browser. To get a list of the nearest datasets, go to the dataset's page (for example, https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:36192) and click the bookmarklet button.

This chart

shows results of the "Top 20 subjects" query. The query is executed every time you load this page, so if you do not see a pie chart, this probably means that the SPARQL endpoint is down.

Implementation details

To harvest metadata we use the public EASY OAI-PMH endpoint without authentication. The data is retrieved in oai-dc format and stored as n-triples using the same schema. Datasets are identified by the dataset URL (example: <https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:36192>).

See dump.py for details.

License

EASY metadata as Linked Open Data is made available under the Open Database License: http://opendatacommons.org/licenses/odbl/1.0/. Any rights in individual contents of the database are licensed under the Database Contents License: http://opendatacommons.org/licenses/dbcl/1.0/.