Thursday, November 7, 2019

New Partners for Nomisma

Several new partners have joined the Nomisma.org numismatic Linked Open Data ecosystem through the database network developed through the Berlin M√ľnzkabinett. This software framework, which is used by about 20 collections in Germany and Austria, now supports the direct-to-Nomisma RDF export detailed in Nomisma.org's documentation. Previously, I had written a PHP script to harvest LIDO XML files (one by one) that were listed in text files from each institution. At one HTTP request per second, it typically took about three hours to generate an RDF export for Berlin that I stored as a static file on the numismatics.org server. Now, it takes only a minute or two to ingest RDF VoID dataset metadata and data dumps directly from the Berlin database.

Now, about three-quarters of the 40 or so collections that contribute data to Nomisma offer direct RDF exports according to our specifications, which is a tremendous advancement toward sustainability of our ingestion workflow. KENOM offers an OAI-PMH API that I have scripted to harvest, and harvesting from the Bibliothèque nationale de France is a combination CSV processing/Gallica OAI-PMH harvesting. The remaining partners have been added into Nomisma by writing bespoke scripts for processing CSV into RDF and storing static files on the ANS server (often, this process includes having to use OpenRefine to map coin type references to URIs). I am hoping that in the next few years, we can transition completely to direct RDF ingestion via our VoID specification or Linked Art JSON-LD harvesting, which I have already begun to prototype in the Nomisma.or backend.

New partners include:
  • Augsburg University
  • Konstanz University
  • Mainz University
  • University of Vienna

These add more than 1,000 coins into Nomisma.org, primarily for OCRE and CRRO.