my %table;
#for my $col_node ( $root->findnodes('//datacolumn') ) {
for my $col_node ( $table_node->findnodes('datacolumn') ) {
    my $col_name = $col_node->getAttribute('name');
    $table{$col_name} = [
        map $_->getValue(),
        $col_node->findnodes('item/@value')
    ];
}