icalendar-import-format-uid

icalendar-import-format-uid is a variable defined in `icalendar.el'.
Its value is

"
 UID: %s"

Documentation:
Format string defining how the UID element is formatted.
This applies only if the UID is not empty! `%s' is replaced by
the UID.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.3 of Emacs.