my $XML = XML::Smart->new(DATA) ;
  
  my $addr0 = $XML->{hosts}{server}[0]{address}[0] ; ## return {address}[0]
  ## ...or...
  my $addr0 = $XML->{hosts}{server}{address} ;       ## return {address}[0]
  
  my $addr1 = $XML->{hosts}{server}[1]{address}    ; ## return {address}
  ## ...or..
  my $addr1 = $XML->{hosts}{server}[1]{address}[0] ;  ## return {address}