oxigraph/testsuite/oxigraph-tests/sparql-optimization/equal_to_same_term_output.rq

SELECT ?s1 ?s2 ?o1 ?o2 WHERE {
    ?s1 ?p1 ?o1 .
    ?s2 ?p2 ?o2 .
    FILTER(sameTerm(?p2, ?p1))
}