Under CGI::Prototype, this would be done by each page having its own template method and inhertiting the engine method to apply to the template: 
package App::Base;

sub engine {
 my($self, $template) = @_;

 # application object
    my $self = shift;
    
    # database handle
    my $dbh = $self->param('dbh');
    
    # get cgi query object
    my $q = $self->query();
    my %post = $q->Vars;

   # $template actions... 
   
# output
    $tmpl->param( tmpl_sub => $tmpl_sub->output() );
    return $tmpl->output;
}

sub template {
 my $tmpl = $self->load_tmpl('main.phtml');

}
package App::This;
use base qw(App::Base);

sub template {
  my $self = shift;
  $self->SUPER::template();
   my $tmpl_sub = $self->load_tmpl('this.phtml');

}

package App::That;
use base qw(App::Base);

sub template {
  my $self = shift;
  $self->SUPER::template();
   my $tmpl_sub = $self->load_tmpl('that.phtml');

}

1;

[download]

And then a render() method would come along and present the templates to the engine.

In reply to CGI::Prototype example of the CGI::Application problem by metaperl
in thread CGI::Application same function code by boboson

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.