Just build the key from the lat and lon as before:

for my $node ($dom->findnodes('/osm/node')) {
    my $tag = $node->findnodes('tag[@k="name"]')->[0];
    print $tag,"\n";
    my $key = "$node->{lat}.$node->{lon}";
    if (exists $HoH{$key})
    {
        print "Matching key found for $key with id $HoH{$key}->{id}\n"
+;
        # Do something useful with it here
    }
}

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In reply to Re^5: Update XML Values using two primary keys by hippo
in thread Update XML Values using two primary keys by pratikpooja

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