Well, my guess is that you're asking about the name of a file. But this is not a question about XML, it just happens that your data is embedded in an XML document. It's a question about your data. I could move this to another forum but there wouldn't be any point, since there aren't any forums about your data here.
If it's just an example you saw in a book and there isn't any context, then don't worry about the exact meaning.