A significant part of your grade this semester is the creation of a web site that utilized XML as a basis for delivering content to the web. What's important here is not that you finish every single detail; more important is providing an overall framework on which you exhibit your understanding of multiple concepts discussed in this class.
Yes, your project is worth a significant portion of your grade. So take it seriously. That being said, I want you to have fun with it. I really don't mind what you choose to do it on, or what data you choose to use for your XML source data.
Although we will not cover the DOM and various dynamic concepts until the end of the semester, it is imperative for you to begin formulating your site design and building your source XML data source file(s) with the DTD or XSD validation part.