- in real life some xfa contains xml like <xfa:data><xfa:Foo><xfa:Bar>...</xfa:data>
since there are no Foo or Bar in the xfa namespace the JS representation are empty
and that leads to errors.
- so the idea is to make all nodes under xfa:data namespace agnostic which means
that ns are removed from nodes in the parser but only xfa:data descendants.
