Quick and dirty:

c:\@Work\Perl\monks>perl -wMstrict -le
"my @data = (
   q{<Answer type='string'>ServerName</Answer>},
   q{<Answer type='string'>10.10.10.11</Answer>},
   q{<Answer type='string'>Windows Server 2012</Answer>},
   );
 ;;
 for my $datum (@data) {
   $datum =~ s{ \A .*? (?<= >) ([^<]*) .* }{$1}xms;
   print qq{'$datum'};
   }
"
'ServerName'
'10.10.10.11'
'Windows Server 2012'
[download]

(Update: However, this solution is fragile; see Parsing HTML/XML with Regular Expressions (thanks to haukex).) The prepended labels I leave to you.

Update: The following works as well and may be preferable to a  s/// substitution as it is simpler:
    ($datum) = $datum =~ m{ (?<= >) [^<]* }xmsg;