Perl External Methods is a way to tie perl functions that live inside ZopeExt:: namespace as methods of Zope objects.
Perl module name, function name and signature are provided through the Zope management interface.
Example:~zope/Extensions/ZopeExt/Hello.pm
package ZopeExt::Hello; sub hello { my $self = shift; my $name = $self->title; return "Hello, my name is $name!"; } 1;