my $data = {
  name => 'name',
  id => 1,
  categories => [
    { id => 1, title => 'projects', ...},
    { id => 2, title => 'index', ...},
  ],
};

##</code><code>##

<TMPL_VAR NAME=ID>: <TMPL_VAR NAME=NAME><br>
<TMPL_LOOP NAME=CATEGORIES>
<TMPL_VAR NAME=ID>/<TMPL_VAR NAME=TITLE> |
</TMPL_LOOP>

##</code><code>##

1: name<br>
1/projects | 2/index |

##</code><code>##

foreach my $key (keys %$result) {
        if ($self->template()->query( name => $key) eq 'LOOP') {
                if ($self->template()->query( name => [$key, 'SET_REVERSE'])) {
                        @{$result->{$key}} = reverse @{$result->{$key}};
                }
        }
}