my $xml_map = {
    serialize=>'xml_out',
    deserialize=>'xml_in',
};
my $yaml_map = {
    serialize=>'Dump',
    deserialize=>'Load',
};

my $xml_serializer = Bridge::Simple->new(
    XML::Simple->new(),
    $xml_map,
);
my $yaml_serializer = Bridge::Simple->new(
    YAML->new(),
    $yaml_map,
);