NFDI

How do you apply a license to a semantic web knowledge graph? I somewhat stumbled across this question during the process of registering the NFDI4BIOIMAGE Knowledge Graph with the NFDI KGI Registry. Amongst other data, the registry form requested the license, under which this KG is published.

Creative Commons Licenses on Wikidata

Ok, but how? The KGI registry’s preferred format is to state the corresponding Wikidata ID. E.g. the Creative Commons License CC-BY 4.0 International is wd:Q6905323. The following wikidata query returns a list of all International 4.0 CC Licenses:

This post describes the NFDI4BIOIMAGE Knowledge Graph (N4BIKG). Many aspects of this project are still very much in the flow including a consensus on which ontologies and terms to employ, how to define various namespaces and much more.

The N4BIKG is accessible through a SPARQO endpoint at https://kg.nfdi4bioimage.de/N4BIKG/sparql. The dataset is split into four named graphs:

PREFIX : <https://nfdi.fiz-karlsruhe.de/ontology#>
PREFIX n4bikg: <https://kg.nfdi4bioimage.de/n4bikg/>
PREFIX nfdicore: <https://nfdi.fiz-karlsruhe.de/ontology/>
PREFIX ome_core: <https://ld.openmicroscopy.org/core/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX t4fs: <http://purl.obolibrary.org/obo/T4FS_>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

select distinct ?graph where {
  graph ?graph {?s ?p ?o}
}

As a convenience, the default graph is the union of all named graphs.