File: functions-tracker-1.rq

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

SELECT tracker:coalesce(?u, ?t, ?s, "default")
{ ?_x a ex:A .
  OPTIONAL { ?_x ex:s ?s }
  OPTIONAL { ?_x ex:t ?t }
  OPTIONAL { ?_x ex:u ?u }
}
ORDER BY tracker:coalesce(?u, ?t, ?s, "default")