my $addr = $xml->{config}{server}->('name','=~','sahara')->{address}[0] ;
  ## the same, it just get the first:
  my $addr = $xml->{config}{server}->('name','=~','sahara')->{address} ;

  ## return all the addresses:
  my @addrs = $xml->{config}{server}->('name','=~','sahara')->{address} ;

  ## Get the first server node:
  my $server = $xml->{config}{server}[0] ;
  ## or without [0], since wihtout always return the 1st:
  my $server = $xml->{config}{server} ;

  ## Or get the server that have a specific name,
  ## when you don't know the order:
  my $server = $xml->{config}{server}->('name','eq','sahara') ;

  my $addr = $server->{address} ;

  ## Print the content:
  print "Server content: $server\n" ;

__DATA__

<config logdir="/var/log/foo/" debugfile="/tmp/foo.debug">
    <server name="sahara" osname="solaris" osversion="2.6">
      <address>10.0.0.101</address>
      <address>10.0.1.101</address>
    </server>
    <server name="gobi" osname="irix" osversion="6.5">
      <address>10.0.0.102</address>
    </server>
    <server name="kalahari" osname="linux" osversion="2.0.34">
      <address>10.0.0.103</address>
      <address>10.0.1.103</address>
    </server>
</config>