Vincenzo-- The example works with the latest version of Yahoo::Search. I compared 1.4.7 with the last version, and found that the problem is that Yahoo seems to have added some whitespace that the search program didn't like/account for. In v1.4.8 they detect & ignore the extra whitespace:

v1.4.7, XML.pm:

76: if ($node->{Data})
77: {
78:     die "oops: node Char='$node->{Char}'" if $node->{Char} ne "";
79:     $val = $node->{Data};
80: }
[download]

v1.4.8, XML.pm:

76: if ($node->{Data})
77: {
78:     if ($node->{Char} =~ m/^\s*$/) {
79:         $node->{Char} = "";
80:     } else {
81:         die "oops [$node->{Char}]";
82:     }
83:     $val = $node->{Data};
84: }
[download]

--roboticus