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"""
SPARQL Update statements can be applied with [`Graph.update`][rdflib.graph.Graph.update]
"""
from pathlib import Path
import rdflib
EXAMPLES_DIR = Path(__file__).parent
if __name__ == "__main__":
g = rdflib.Graph()
g.parse(f"{EXAMPLES_DIR / 'foaf.n3'}", format="n3")
print(f"Initially there are {len(g)} triples in the graph")
g.update(
"""
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dbpedia: <http://dbpedia.org/resource/>
INSERT {
?s a dbpedia:Human .
}
WHERE {
?s a foaf:Person .
}
"""
)
print(f"After the UPDATE, there are {len(g)} triples in the graph")
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