ontology

What is the difference between DatatypeProperty, ObjectProperty, & FunctionalProperty, and when should I use them?

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The first two of these, DatatypeProperty and ObjectProperty, describe what kind of values a triple with the property should have. Datatype properties relate individuals to literal data (e.g., strings, numbers, datetimes, etc.) whereas object properties relate individuals to other individuals. Something like hasAge would typically be a datatype property, since an age is a number, … Read more

What is the difference between GraphQL and SPARQL?

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Context Datatourisme is a platform that allows to publish (via the Producteur component) and to consume (via the Diffuseur component) POI-related open data. It seems you have linked to a particular application developed over Diffuseur with a help of GraphQL Voyager. The application illustrates capabilities of the GraphQL API exposed by Diffuseur. The API documentation … Read more

Are there any tools to visualize a RDF graph? (please include a screenshot)

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Gephi was already mentioned, but I’ll incode screenshots and a short description here. Gephi can not just visualize graphs but also supports analyzing, layouting and further importing and exporting. There is a Semantic Web Import Extension that allows you to directly query (via SPARQL) or import RDF data. https://wiki.gephi.org/index.php/SemanticWebImport (You can install it directly within … Read more