my ($self, $beg, $end, $field) = @_;
my $over = $self->{ng}->over;
my $msgs = $over->query_xover($$beg, $end);
scalar(@$msgs) or return;
my $tmp = '';
my ($self, $beg, $end, $field) = @_;
my $over = $self->{ng}->over;
my $msgs = $over->query_xover($$beg, $end);
scalar(@$msgs) or return;
my $tmp = '';