District data to XML

I am right now at the Microsoft TechEd in Barcelona, mostly for learning about the new technologies for my job as a programmer. But hearing loads of talk about useful new things around XML, and because I haven't yet had the time to learn much about how to create and use XML so far, the idea of converting the spreadsheet collecting the data into a set of XMLs. Apart from learning XML in much more details than before, it will also allow me to collect data which does not fit into the simple spreadsheet type, and also create small tools querying the XMLs, e.g. to find all the territorial changes related with one district - minor districts split off, single subdistricts getting reassigned and so on. Right now I think the first thing to do is to collect all those Royal Gazette references into one list, saving what they are about, which entities affected... Then the first bigger task would be convert the small application I created to parse the population data websites of DOPA and convert them into the tambon tables in the Wikipedia articles to actually use a much smarter data structure, both for saving the data as well as internally.