package Foo;

use Exporter;
@ISA = qw(Exporter);
@EXPORT_OK = qw(access_internal_var);

use strict;

my %Internal_Var_Here;

sub access_internal_var {
    # Insert code here to access the hash
}

##</code><code>##

use strict;

package Foo;

use Exporter;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(access_internal_var);
.
.
.