z/OS ISPF Dialog Tag Language Guide and Reference
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Variable validation

z/OS ISPF Dialog Tag Language Guide and Reference
SC19-3620-00

DTL allows you to define translate lists and validity checks as part of the variable class definition by using tags nested within the VARCLASS tag. These built-in translations and checks are especially useful because ISPF automatically performs them on variable values, so the dialog application does not need to.

Note: Translations and checks are performed only on variable values that are intended for display. For instance, before displaying the data from a variable specified on the DATAVAR attribute of a DTAFLD tag, ISPF performs any specified translations on the variable retrieved from the application to construct the correct display value. However, ISPF does not perform translations on a variable specified as the CHECKVAR attribute of a CHOICE tag.

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