use strict;

use XML::Handler::AxPoint;
use XML::Filter::SAX1toSAX2;
use XML::Parser::PerlSAX;

my $handler = XML::Handler::AxPoint->new();
my $filter = XML::Filter::SAX1toSAX2->new(Handler => $handler);
my $parser = XML::Parser::PerlSAX->new(Handler => $filter);

$parser->parse(Source => { SystemId => "foo.xml" });

__END__
yields:
Can't call method "push_context" on an undefined value at
/usr/lib/perl5/site_perl/5.6.0/XML/Filter/SAX1toSAX2.pm line 25.