XML, DTD or XSD, XSLT and XSL-FO, XLIFF, XJSON... All of these are X-Files and for me they were at the beginning pretty frightening and unbelievable.

But as developers we sooner or later have to deal with them. So understanding the problems these different files want to solve, knowing their advandategs as well as disadvantages and being able to handle them can help us in our daily work.

So let me take you onto a journey to de-mystify the X-Files and see what their different purposes are and how we might even be able to use them to ease our lifes. And perhaps we can even see why they got such a bad reputation and why that is only half of the truth...