in reply to How can we read input argument file to a script from its main library?

In the script, read the file name from $ARGV[0] or use a library as others have recommended. Then pass the file name as an argument to the library: 
package My::XML;

sub parse_xml {
    my ($filename) = @_;
    ...
}

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and call

use My::XML;
my $filename = $ARGV[0];
my $data = parse_xml($filename);

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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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