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<volume>4</volume>
<issue>12</issue>
<year>2003</year>

open (IN, "<xxx.in");
while(<IN>)
...
    print "Volume: $vol\n";
    print "Issue: $iss\n";
    print "Year: $yr\n";

Volume: 2003
Issue: 2003
Year: 2003

Volume: 4
Issue: 12
Year: 2003