File: functions-tracker-2.rq

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PREFIX ex: <http://example/>
PREFIX ns: <http://www.w3.org/2005/xpath-functions#>

SELECT tracker:coalesce(?title, tracker:string-from-filename(?filename), "unknown")
{ ?_x a ex:A .
  OPTIONAL { ?_x ex:title ?title }
  OPTIONAL { ?_x ex:filename ?filename }
}
ORDER BY tracker:coalesce(?title, tracker:string-from-filename(?filename), "unknown")