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

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PREFIX : <http://www.example.org/>
SELECT (GROUP_CONCAT(?opt) AS ?g) WHERE { ?baseS a :ex OPTIONAL { ?baseS :opt ?opt } }