reproduce:
1) open attached XML Form document (note Chinese font is necessary)
2) fill all text input box with some Chinese characters (you can copy & past
near-by characters) and submit the form, it would write the file:///tmp/test.xml
3) check the submitted XML (I also attached it in this email)
The Chinese characters in tag name are encoded in UTF-8
The Chinese characters in text nodes are encoded as XML entities.
The XML file doesn't have encoding="UTF-8"

Expected:

Using UTF-8 encoded tag name (Chinese characters) while not setting
encoding="UTF-8" wouldn't be appreciate. The best would be setting encoding to
"UTF-8", and don't even use entities for text nodes.