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Blazegraph(TM) RDF Test Suites

There is a newer version: 2.1.4

SELECT *
WHERE
{ 
  BIND(1 as ?A)
  { BIND(2 as ?B) }
  UNION
  { BIND(3 as ?C) }
  UNION
  { }

  OPTIONAL { BIND( 'unbound' as ?D ) }
  OPTIONAL { BIND( 'unbound' as ?B ) }
  OPTIONAL { BIND( 'unbound' as ?C ) }
}