/usr/share/doc/cdebconf/directives.txt is in cdebconf 0.192.
This file is owned by root:root, with mode 0o644.
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cdebconf implements an extension to the Debconf specifications called
directives. Directives are written in templates or substitutions enclosed into
"${!" and "}", for example "${!DIRECTIVE}".
. Directives are not expanded like normal variables and will be given back
/!\ as is by GET and METAGET commands. This is the desired behaviour when,
~~~ for examples, one implements a dynamic Choices field for select questions
with directives in SUBSTitutions.
Directives are expanded according to the result of the lookup_directive()
"method" implemented in the frontends when question_get_field() is called.
By default, they will be expanded to the empty string, removing them from the
returned value for unimplemented directives.
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