the XPS document writer is a virtual printer you use to create XPS documents
(much like a free program called "pdf995" is a virtual printer that creates pdf documents from what you are printing with them).
As for the fax thing, it should be a Windows 7 trick, a virtual fax pointing to the actual device, this "shortcut" is used if you want to easily share it on the home network (and send fax from a PC that isn't the one connected to the device). It uses this trick when the driver
from the manufacturer does not allow to share the fax on its own, or simply to have more control over the device.
Either of these two is perfectly normal, move along