Fork of https://github.com/oxigraph/oxigraph.git for the purpose of NextGraph project
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oxigraph/testsuite/oxigraph-tests/sparql/unbound_variable_in_subquer...

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PREFIX ex: <http://example.com/>
SELECT ?a ?b WHERE {
BIND(ex:a as ?a)
{SELECT ?b WHERE { BIND(ex:b as ?b) FILTER(!BOUND(?a))}}
}