   The RFC Editor has asked that we provide a list of items for which
   there will never be a break around the slash.  The test says that
   PDF/A and S/MIME should not be broken when they occur.

   We also deal with the possiblity of some long items such as
   this/is/a/long/test which will not break either.  We only match exact
   items however so PDF/A/3 will be broken as the algorithm currently
   stands.

   What about addresses: 192.168.20.0/16, 192.168.0.0/24,
   192.168.0.0/30, and prefix length indications like /48 /56 /64 /72
   /80 /88 /96 and so on?  These should not be broken after the forward
   slash.
