You're getting stuff as cp1252 — "’" is 92 in cp1252 — but you're outputting it as is in a document you claim is UTF-8.
Always decode your inputs. Always encode your outputs. You are apparently doing neither.
Note that the quote is character U+2019, so the proper escape is ’ or ’, not \.
If you pass properly decoded text to the following function, it will produce 7-bit clean UTF-8 (aka US-ASCII) XML text and XML attribute values.
sub encode_entities {
my ($self, $text) = @_;
$text =~ s/&/&/g;
$text =~ s/</</g;
$text =~ s/>/>/g;
$text =~ s/"/"/g;
$text =~ s/'/'/g;
$text =~ s/([^\x20-\x7E])/sprintf("&#x%X;", ord($1))/eg;
return $text;
}
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