Give me an input, the expected output, and I will show you I can do a more readable shorter and easier version of the transofrmation with jquery. The XSLT is so unreadable it requires comments.

I did once a less than 2k library in js that loaded the TTML markup in an hidden div and would show it on an HTML 5 video player with extra formatting.

Why would someone need XSLT in 2014? It was a failure in 2000.