Sorry, no XML::Xpath here. Here's what you might do using XML::Rules:

use XML::Rules;

my $parser = XML::Rules->new(
 namespaces => {
    'http://alexa.amazonaws.com/doc/2005-10-05/' => '',
    'http://awis.amazonaws.com/doc/2005-07-11' => '',
 },
 rules => [
    'DataUrl,Asin,Rank,RequestId,StatusCode' => 'content',
    'TrafficData,Alexa,UrlInfoResult,OperationRequest,ResponseStatus' 
+=> 'no content',
    'Response' => sub {
        print <<"*END*"
Do something with request $_[1]->{OperationRequest}{RequestId}, it was
+ a $_[1]->{ResponseStatus}{StatusCode}
 URL: $_[1]->{UrlInfoResult}{Alexa}{TrafficData}{DataUrl}
 Rank: $_[1]->{UrlInfoResult}{Alexa}{TrafficData}{Rank}
*END*
        return;
    }
 ],
);

# or, if you want to simplify the data as you parse them:

my $parser = XML::Rules->new(
 namespaces => {
    'http://alexa.amazonaws.com/doc/2005-10-05/' => '',
    'http://awis.amazonaws.com/doc/2005-07-11' => '',
 },
 rules => [
    'DataUrl,Asin,Rank,RequestId,StatusCode' => 'content',
    'UrlInfoResult,OperationRequest' => 'no content',
    'TrafficData,Alexa' => 'pass no content',
    'ResponseStatus' => sub { return 'ResponseStatus' => $_[1]->{Statu
+sCode}},
    'Response' => sub {
        print <<"*END*"
Do something with request $_[1]->{OperationRequest}{RequestId}, it was
+ a $_[1]->{ResponseStatus}
 URL: $_[1]->{UrlInfoResult}{DataUrl}
 Rank: $_[1]->{UrlInfoResult}{Rank}
*END*
        return;
    }
 ],
);
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