my %nums;
while ($reader->nextElement( 'Number' )) {
    my $number = $reader->copyCurrentNode(1)->textContent;

    $reader->nextElement( 'address' ); 
    my $node = $reader->copyCurrentNode(1); 
    my $infohash = {
        house  => $node->getElementsByTagName( 'housenumber' )[0]->textContent,
        street => $node->getElementsByTagName( 'streetname'  )[0]->textContent,
    };
    $nums{$number} = $infohash;
}