return value;
{ if ( StringUtil.isEmpty( (String) value )) return null;  return value; }
	public Object validateValue( ReportDesign design, PropertyDefn defn,			Object value ) throws PropertyValueException	{        if ( value == null )            return null;        if ( value instanceof String )        	return value;                    throw new PropertyValueException( value, PropertyValueException.DESIGN_EXCEPTION_INVALID_VALUE, EXPRESSION_TYPE );    }