An example xml compilation for an image could be something like this:
<?xml version="1.0">
<image>
<src>the url to the image</src>
<height> image height in pixels</height>
<width> image width in pixels</width>
<title> whatever title you want for the image</title>
</image>
More information can be found at http://www.w3schools.com/xml/default.asp
link removed by moderator - please do not repeat.