Keep the name "simple". Do not include blanks or special characters. A simple name like YourName.gif will do. Special characters will mess up the URL when you try to retrieve it. If you get a database error to the effect of "duplicate key", then simply use the update button instead of insert. It just means someone else has already used that name. Since this is a demo, you can just overwrite their stuff.
What should the name be:

Wanna peek at what others have loaded...
DB Prism/Cocoon2 Java Stored Procedures Demos
Cocoon2 Demos Home Page
(C) Marcelo Fabián Ochoa