'Wikidata ontology to Produce a larger subgraph by extracting the subgraphs of some relevant books, birthplace, education institutions, etc

I want to load the wikidata ontology in stardog studio to produce a larger subgraph by extracting the subgraphs of some relevant books, birthplace, education institutions from the wikidata. I am not sure from where I can download the wikidata ontology. I am doing thesis on representation of wikidata in RDF and Property graph and KGTK. For this I have seen the single Entity for instance, Q42 and produce the subgraph of Q42 in RDF, Property graph and KGTK. Now my next task is to produce a larger subgraph by extracting the subgraphs of some relevant books, birthplace, education institutions, etc.

My supervisor has given me just this link https://www.wikidata.org/wiki/Wikidata:WikiProject_Ontology. but i dont know from where i get the wikidata ontologies and how can i load them in stardog studio.



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