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Default value that is known by the target application and thus does
not need to be written in the configuration file.

=back

To know which attributes to use, you should read the
documentation of the target application.

For instance, C<AddressFamily> parameter (sshd_config(5)) is specified
with: I<Specifies which address family should be used by sshd(8).
Valid arguments are "any", "inet" (use IPv4 only), or "inet6" (use
IPv6 only).  The default is "any".>

For Config::Model, C<AddressFamily> is a type C<leaf> element,
value_type C<enum> and the application falls back to C<any> if this
parameter is left blank in C<sshd_config> file.

Thus the model of this element is :

 AddressFamily => {
   type             => 'leaf',
   value_type       => 'enum',
   upstream_default => 'any',
   description      => 'Specifies which address family should be used by sshd(8).',
   choice           => [ 'any', 'inet', 'inet6' ]
 }

=head2 Simple list or hash element

Some configuration parameters are in fact a list or a hash of
parameters. For instance, C<approx.conf> can feature a list of remote
repositories:

 # remote repositories
 debian     http://ftp.fr.debian.org/debian