Why do you declare $xml? Why do you include OFFLINE as one of the files?

Probably something like

my @libxml_args;
if (OFFLINE) {
    @libxml_args = ([IO => \*DATA]);
} else {
    @libxml_args = map { [location => $_] } $io->all(0);
}
for my $libxml_arg (@libxml_args) {
    my $dom = 'XML::LibXML'->load_xml(@$libxml_arg);
    ...
}
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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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