In most specs when we refer to faults we say something like:

...generate a wsxx:FooBar fault.

However, in some cases we say:

...generate a FooBar fault. 
(notice the missing namespace/prefix qualifier).

Proposal:
for consistency we should go thru all specs and add the appropriate
prefix to each reference.

Once example from Transfer:
then the service MUST generate an UnknownDialect fault.

would become:
then the service MUST generate an wst:UnknownDialect fault.