vBulletin XML Style
 

Does anyone know of an XML style/skin for vBulletin? I would like to write a client similar to Tapatalk or ForumRunner. I know that both use a plugin to serve the client XML but this seems like a bad idea to me, as it opens up a how new world of possible exploits and vulnerabilities. I think a cleaner solution would be to just have a skin that serves XML.

Is there one around? Perhaps even for 4.x and/or 5.x?

Thanks!