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from rdflib import FOAF, Graph, URIRef
from rdflib.compare import isomorphic
def test_skolem_de_skolem_roundtrip():
"""Test round-trip of skolemization/de-skolemization of data.
Issue: https://github.com/RDFLib/rdflib/issues/1404
"""
ttl = """
@prefix wd: <http://www.wikidata.org/entity/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
wd:Q1203 foaf:knows [ a foaf:Person;
foaf:name "Ringo" ].
"""
graph = Graph()
graph.parse(data=ttl, format="turtle")
query = {
"subject": URIRef("http://www.wikidata.org/entity/Q1203"),
"predicate": FOAF.knows,
}
# Save the original bnode id.
bnode_id = graph.value(**query)
skolemized_graph = graph.skolemize()
# Check the BNode is now a URIRef after skolemization.
skolem_bnode = skolemized_graph.value(**query)
assert type(skolem_bnode) is URIRef
# Check that the original bnode id exists somewhere in the uri.
assert bnode_id in skolem_bnode
# Check that the original data is not isomorphic with the skolemized data.
assert not isomorphic(graph, skolemized_graph)
# Check that the original graph data is the same as the de-skolemized data.
de_skolemized_graph = skolemized_graph.de_skolemize()
assert isomorphic(graph, de_skolemized_graph)
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