var instance = new GcSpread.Sheets.Calc.Expressions.RangeExpression(startRow,
                                                                   startColumn,
                                                                   endRow,
                                                                   endColumn,
                                                                   startRowRelative,
                                                                   startColumnRelative,
                                                                   endRowRelative,
                                                                   endColumnRelative);
var value; // Type: Object
value = instance.getRange(baseRow, baseColumn);