To write a UDT, follow these steps:

1. Name your UDT, using CBDxCnnn format, where x is the language code and nnn is the number assigned to your UIM. (See CBDZUDT Macro.)
   Note:
   IBM provides a sample UDT in SYS1.SAMPLIB(CBDSUDT). Each IBM-supplied UDT has the CBDxSnnn format.
2. Write a CBDZUDT macro for each UDT entry. (See Figure 5, which is a sample IBM-provided English UDT.)
   Note:
   Group all CBDZUDT macros that have identical parameters. For example, group all CBDZUDT macros with FEAT parameters sequentially.
3. Install the UDT in the same library that contains the UIMs.