my $data = XMLin($xml_string, ForceArray => 1);

for my $inf (@{ $data->{SellerInformation} }) {
    print $inf->{Seller}[0]{sellerIdFromProvider}, "\n";
    for my $location (@{ $inf->{TaxableLocationsCollection}[0]{TaxableLocation} }) {
        print "\t", $location->{locationValue}, "\n";
    }
}