Convert srt or ass subtitles to xml

Hi There!

I am going to subtitle a dcp for the very first time. I have absolutely no idea of how to do this. I have a moderate capacity computer (windows vista). I figured creating the srt or ass subtitle file with aegisub first and then converting the subtitle file to xml (dcp compatible format. So my questions are:

- Is there any windows vista 32 gb compatible freeware for converting srt or ass to xml?

- Is there any windows vista 32 gb compatible freeware for creating the xml file directly and then add it to the dcp?

- Are there any tutorials out there for such freeware?

Any help would be greatly appreciated.

Thanx