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RDF and ontology mappings

From NeoWiki Demo

Every NeoWiki page's Subjects are available as RDF. The same data is offered in two ways:

  • A native projection in NeoWiki's own vocabulary. Lossless, always available, no setup.
  • Ontology projections that re-express the data in an established vocabulary such as the Europeana Data Model (EDM). Each one is defined by a Mapping page.

Each export is produced on demand from the page's current data and downloads as a Turtle or TriG file. A projection can also be kept in a SPARQL store and queried live — see SPARQL queries on wikis that have a store configured, such as the NeoWiki development stack.

The Mapping pages

Each Mapping binds one Schema to one target ontology. This wiki ships four, all targeting EDM:

Explore the projections

Follow these in order; each link downloads the projection so you can read it.

  1. Pablo Picasso, native vs EDM: the native file has everything, including the two-layer "Born in" relation and the page metadata; the EDM file is an edm:Agent carrying only the mapped vocabulary, with the unmapped Source absent.
  2. Málaga, EDM: an edm:Place — and the very same entity IRI that Picasso's rdaGr2:placeOfBirth points at, because sibling projections share entity IRIs.
  3. The Milkmaid, EDM: an edm:ProvidedCHO whose dc:creator is the IRI of Vermeer (an edm:Agent) and whose edm:currentLocation is the Rijksmuseum.
  4. Johann Sebastian Bach, EDM: Bach's birth is modelled as its own Birth Subject instead of flat fields, so his edm:Agent projects sparse — the same Person Schema as Picasso, a different modelling style.
  5. ACME Inc, EDM: its Company Schema has no EDM Mapping, so the EDM projection comes back empty — a Schema without a Mapping is simply absent, which is how conformant output stays conformant.

Learn more

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