z/OS ISPF Dialog Tag Language Guide and Reference
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Rules for “%variable” names

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

When a "%varname" notation is found as an attribute value, the "%varname" entry must have these characteristics:
  • 2-9 characters in length
  • The first character is a “%”.
  • The second character must be A-Z, a-z, @, #, or $.
  • Remaining characters, if any, can be A-Z, a-z, @, #, $, or 0-9.

Lowercase characters are translated to their uppercase equivalents

The first position of a valid name is replaced by an “&”.

Names composed of valid characters that are longer than 9 bytes are truncated to 9 bytes. Names that are not valid are set to blank.

It is the responsibility of the application to provide a valid value in the variable before the panel is displayed.

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