Config::Model::Annotation3pm

 use Config::Model ;
 # define configuration tree object
 my $model = Config::Model->new ;
 $model ->create_config_class (
    name => "MyClass",
    element => [
        [qw/foo bar/] => {
            type => 'leaf',
            value_type => 'string'
        },
        baz => {
            type => 'hash',
            index_type => 'string' ,
            cargo => {
                type => 'leaf',
                value_type => 'string',
            },
        },
    ],
 ) ;
 my $inst = $model->instance(root_class_name => 'MyClass' );
 my $root = $inst->config_root ;
 # put some data in config tree the hard way
 $root->fetch_element('foo')->store('yada') ;
 $root->fetch_element('baz')->fetch_with_id('en')->store('hello') ;
 # put annotation the hard way
 $root->fetch_element('foo')->annotation('english') ;
 $root->fetch_element('baz')->fetch_with_id('en')->annotation('also english') ;
 # put more data the easy way
 my $steps = 'baz:fr=bonjour#french baz:hr="dobar dan"#croatian';
 $root->load( steps => $steps ) ;
 # dump resulting tree with annotations
 print $root->dump_tree;
 # save annotations
 my $annotate_saver = Config::Model::Annotation
  -> new (
          config_class_name => 'MyClass',
          instance => $inst ,
          root_dir => '/tmp/', # for test
         ) ;
 $annotate_saver->save ;
 # now check content of /tmp/config-model/MyClass-note.pl