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   Notice that the 1:1 relation control does not only display the data
   belonging to the related file, but does also allow edit to be performed
   directly.

   The most common usage of 1:1 relations is for splitting the file's fields
   in two or more distinct groups (read: files): the first group will contain
   the important (mandatory) information, while the second group is used to
   manage less important (or optional) data.

    . Useful information about the input validation that can be
       performed on the data entered into the 1:1 relation control, please
       consult the Field controls chapter.