I'm new to xml and having an issue listed below:

I have a sample xml file:

<?xml version="1.0" encoding="utf-8"?>
<tt xml:lang="en" xmlns="http://www.w3.org/ns/ttml" xmlns:tts="http ://www.w3.org/ns/ttml#styling"
xmlns:ttp="http ://www.w3.org/ns/ttml#parameter" xmlns:ttm="http ://www.w3.org/ns/ttml#metadata"
...