package Hunting::Snark;
use Bellman qw(foo bar);

# Bellman's exported symbols go into namespace Hunting::Snark
# hence &Hunting::Snark::foo is aliased to &Bellman::foo

package Boojum;

foo(); # is an undefined subroutine. There is no &Boojum::foo


##</code><code>##

...
package Boojum;
use Bellman qw(foo bar);

foo(); # &Boojum::foo is now defined. aliased to &Bellman::foo