begin
  CheckAndLog('Table',:New.ID, 'FIELDx',
                     :Old.Fieldx, :New.Fieldx);
  CheckAndLog('Table',:New.ID, 'FIELDx',
                     :Old.Fieldx, :New.Fieldx);
  CheckAndLog('Table',:New.ID, 'FIELDx',
                     :Old.Fieldx, :New.Fieldx);
  CheckAndLog('Table',:New.ID, 'FIELDx',
                     :Old.Fieldx, :New.Fieldx);
  CheckAndLog('Table',:New.ID, 'FIELDx',
                     :Old.Fieldx, :New.Fieldx);
  CheckAndLog('Table',:New.ID, 'FIELDx',
                     :Old.Fieldx, :New.Fieldx);
...
End;

DECLARE
   /* Emulate the basic idea: a pseudo collection of records, in which
      each record contains information about the column in the table -
      the old and new values, has it been changed, etc.
      
      Then SQL%COLUMNS and SQL%TRIGGER_TABLE provide access to this 
      information at runtime, inside the trigger.
   */
   TYPE trig_column_info_rt IS RECORD (
      NAME         VARCHAR2 (30)
    , old_value    INTEGER-- ,
      new_value    INTEGER-- ,
      is_changed   BOOLEAN
   );

   TYPE trig_columns_t IS TABLE OF trig_column_info_rt
      INDEX BY PLS_INTEGER;

   SQL%COLUMNS   trig_columns_t;
BEGIN
   FOR indx IN 1 .. SQL%COLUMNS.COUNT
   LOOP
      IF SQL%COLUMNS (indx).ischanged
      THEN
         CheckAndLog(SQL%TRIGGER_TABLE, SQL%COLUMNS (indx));
      END IF;
   END LOOP;
END;