for e.g
$url={will contain the 10 url's grepped from xml result file}

$value=sim();#will contain the similarity computed for all the ten results;

%hash;
sim{
#here i compute similarity between query title and resulted snippet..
return $val;#i will return similarity value for each result
}


$hash{$value}=$url;#storing key & value in hash

#i will sort the keys in hash in descending order to get the highest value in top and print the url associated with that as a ouput..