class CGXExMapHolder
This class acts as a manager of the table and handler maps (please refer to the sections on global macros and handlers. It is used as a base class for applications that have Excel read/write support. This object can then be accessed from anywhere in the application to get at the handlers. Each type of Excel record that is supported will be interpreted by exactly one handler/table. These maps hold these handlers and tables. They will be called from various places in the Excel read/write code to get at the tables and handlers. These maps are defined in the application and can be changed to have additional or fewer entries than those supported by default.
