Converting subtitles to xml format

Hy there,
Could someone guide me how to convert some subtitles into xml format? I need to use xml format for Captions for a web flash player.
My subtitles are in .ass format and i can't find any solution to convert them to .xml to be comptatible with the video player.
I have tried a lot of solutions to convert them to xml format but the subtitles won't show on the player.