Hey :)
The best thing to do for future questions like this is to check out our online documentation and knowledgebase. A quick word search will turn up the answer for you.
There is no longer need for XML files. We have a built in demo content importer, directly in theme options on the General tab. And its even better than XML files because its imports everything, not just pages and posts. It gives you pages, posts, sliders, widgets, sidebars, theme options and more.