1. create sub start_document in your handler package. It can be empty.
2. create sub set_document_locator.

sub new {
  my $proto = shift;
  my $class = ref($proto) || $proto;
  my $self = {};
  return bless $self, $class;
}

sub start_document
{
  # Empty. But MUST exist.
}

sub set_document_locator
{
  my ($self, $params) = @_;
  $self->{'_parser'} = $params->{'Locator'};
}

sub start_element
{
  my $self = shift;
  print Dumper($self->{'_parser'}->location());
}
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