Can someone point me to a good tutorial explaining the Entity Framework using an XML file instead of a database? I have seen some good tutorials with SQL databases, but I can't make the leap to an XML file.
Entity Framework itself is provider-based, and is designed to operate over a relational database. If you really wanted to, you could write your own provider for EF that reads from/writes to an xml file, but it would be a huge amount of work.
I expect you should really be looking at one of:
Entity Framework doesn't have a natural fit in this scenario.
Linq to XML isn't all that much actually. I'd go with a serializable solution instead.