This form of TRANSFORM is a shorthand version of Inline TRANSFORMs. In this form,

TRANSFORM(LEFT)

is directly equivalent to

TRANSFORM(RECORDOF(LEFT), SELF := LEFT)

Example:

namesIdRecord assignId(namesRecord L) := TRANSFORM
  SELF := L; //move like-named fields across
END;
projected1 := PROJECT(namesTable, assignId(LEFT));
projected2 := PROJECT(namesTable, TRANSFORM(namesIdRecord,
              SELF := LEFT));
projected3 := PROJECT(namesTable, TRANSFORM(LEFT));
//projected1, projected2, and projected3 all do the same thing

See Also: RECORD Structure, RECORDOF, TYPEOF, JOIN, PROJECT, ITERATE, ROLLUP, NORMALIZE, DENORMALIZE, FETCH, PARSE, ROW