The second form constructs a record from the row passed to it using the resultrec the same way the TABLE function operates. This is typically used within a TRANSFORM structure as the expression defining the output for a child dataset field.

Example:

AkaRec := {STRING20 forename,STRING20 surname};
outputRec := RECORD
UNSIGNED id;
DATASET(AkaRec) children;
END;
inputRec := {UNSIGNED id,STRING20 forename,STRING20 surname};
inPeople := DATASET([{1,'Kevin','Halligan'},{1,'Kevin','Hall'},
                     {1,'Gawain',''},{2,'Liz','Hall'},
                     {2,'Eliza','Hall'},{2,'Beth','Took'}],inputRec);
outputRec makeFatRecord(inputRec L) := TRANSFORM
  SELF.id := l.id;
  SELF.children := ROW(L, AkaRec); //using Form 2 here
END;
fatIn := PROJECT(inPeople, makeFatRecord(LEFT));
outputRec makeChildren(outputRec L, outputRec R) := TRANSFORM
  SELF.id := L.id;
  SELF.children := L.children + 
                   ROW({R.children[1].forename,R.children[1].surname},AkaRec);

END;
r := ROLLUP(fatIn, id, makeChildren(LEFT, RIGHT));