It is in our plans to extend the collection of existing data sources and provide you with means to directly use XML, CSV, Excel files as data source for your reports. Meanwhile, you will have to read the XML
into a DataSet or other custom business object in order to use it in a report.
Let us know if you have any further questions.
Have you tried the new visualization options in Telerik Reporting Q2 2013? You can get them from your account.