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<host id="bobssite" root-directory="."> 
  <host-alias>bobssite.autossl.net</host-alias>
...
  <host-alias>www.billsothersite.com</host-alias>
  <host-alias>bobssite.dealer.net</host-alias>
</host>

#!/usr/bin/perl
use strict;
...
        push @{ $host_contents{$host_id} }, $1;
    }
}