Starting with the XML basics, learn about well formed and valid documents, encoding, and recoding and XSD validation. See examples in Delphi for Win32 and Delphi Prism showing you which tool to choose when. Finally, learn where things can go wrong and how to prevent that: improper but well formed XML, copying data between XML documents, convert XML to tables and objects, etc.
This session shows you that Unicode and other encodings are not scary. They help you in exchanging data with other systems and addressing people that use other characters than U.S. ASCII. Learn about Unicode, ISO-8859, CodePages, Windows-1252, UTF, single-byte, multi-byte, encoding, re-encoding, differences in Delphi and Delphi Prism, and much more. See how to fix code that failed before as well.