Complicated solution based on a regex and a custom matcher, and it doesn't
work.
No special handler, and the fragment is extracted from the URI.. however,
the fragment part is always empty. Apparenly, fragments are stripped off
by some browsers on the client side.. makes sense.
Compiles and runs. Fragment based disambiguation.
Abandoning the use of the fragment, since the URI spec actually says that
the client should strip off the fragment before calling the server.
The foundation for matching requests for a PreprId resource or a view of
it.