TBTF Intro text comment

In the section entitled "Introduction to the SOAP Binding Framework", para 2:
The last statement allows different transports on different message hops.
However, in the case of an end-to-end security association an assumption is
made about the willingness of an intermediary to accept this message even if
it is unwilling or unable to do participate.

I propose adding the following text at the end of that paragraph:
An intermediary MUST generate a SOAP fault if it is not able to accept a
SOAP message without violating existing end-to-end conditions of the message.

---Raj