# filename: ex130.rq

PREFIX ab: <http://learningsparql.com/ns/addressbook#>

SELECT ?courseName
FROM <ex069.ttl>
FROM NAMED <ex125.ttl>
FROM NAMED <ex122.ttl>
WHERE
{
  { ?course ab:courseTitle ?courseName }

  UNION

  {GRAPH ?g { ?course ab:courseTitle ?courseName } }

}