http://xmlpull.org/v1/doc/features.html#names-interned
http://xmlpull.org/v1/doc/features.html#expand-entity-ref
http://xmlpull.org/v1/doc/features.html#xml-roundtrip
http://xmlpull.org/v1/doc/features.html#detect-encoding
http://xmlpull.org/v1/doc/features.html#serializer-attvalue-use-apostrophe