.in 3

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.
