Github user JohannesDaniel commented on the issue:
https://github.com/apache/nifi/pull/2587
Hi @pvillard31
thank you for your comments! I realized all your suggestions. I like your
news regarding the performance :-) Which kind of transformation did you test?
XML => Record or XML => JSON (e. g. with ConvertRecord)?
For any reason some tests disappeared for a certain commit at my local git
(probably, I wanted to reorder the tests, but deleted them, omg ...). However,
I inserted them again (this is why there are many more tests now).
In addition, I adjusted the definition about how namespaces shall be
treated.
I implemented several tests for XMLReader to verify that the usage of
expression language works as expected.
However, I was not able to reproduce your observation regarding the empty
record for the header
```
<?xml version="1.0" encoding="utf-8"?>
```
I implemented the following tests:
```
testSimpleRecordWithHeader()
testSimpleRecordWithHeaderNoValidation()
```
Actually, they work as expected.
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