This manual discusses extending IBM Informix Dynamic Server by using user-defined routines (UDRs) and user-defined data types (UDTs). You can use UDRs and never use a UDT. Conversely, you can use UDTs and never use UDRs. However, many of the ways that you extend data types require that you write routines to support those extensions.
This chapter summarizes the organization of the chapters in this book and describes which portion of the book you will need to use, depending on your goals.
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