Why not just use normal hash access?
my $user_str_toplevel = 'depTar';
my $user_str_secondlevel = 'name';
my $xml = { 'depTar' => { 'name' => 'c_p20', 'loc' => 'srvr1' }};
print $xml->{$user_str_toplevel}{$user_str_secondlevel};
If you want the user to be able to enter their key in the format of "{depTar}{name}", it should just be a simple matter of parsing to convert that into single keys for hash access.
Given that your source format is XML, XML::XPath might be worth looking at instead.
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