Upload limitations

Hello,

While implementing upload control in XSLTForms 
(http://www.agencexml.com/xsltforms/uploads.xml), I was wondering in 
what real use cases it can be used.

With xsi:anyURI type, the server only gets a filename (usually prefixed 
by "fakedpath") for security reasons. So, only the short name (not the 
full path) is meaningful.

With xsi:hexBinary and xsi:base64Binary, the full content of the chosen 
file is copied and expanded (2 times or 1.67 times respectively) within 
an instance. Uploading big files will require time (and memory) and a 
progress bar with a cancel option would be useful and, then, submission 
will also take time...

So, what are the effective or expected use cases for the upload control?

Thank you for your answers!

-Alain