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  1. or download this
    for my $id (keys %{ $xml->{book} }) {
    for my $s (keys %{ $xml->{book}{$id} }) {
        print "$s: @{ $xml->{book}{$id}{$s} }\n";
    }
}
  2. or download this
    open file.xml ;
for //book
...
         by (authors/author/firstname | authors/author/lastname)
         '(' isbn (isbn) ')' ;
  3. or download this
    ($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,