RE: wire stack words and diagram

>SOAP 1.2 also introduces Message Exchange
>Patterns (MEPs), which are a 3rd type of "feature"
>(supported by bindings only).

I don't fully understand the "supported by bindings only" part, because it
seems to imply that a particular MEP can exist only if the underlying
binding naturally supports it. For example, I could have a Request-Response
MEP with an HTTP binding but not with Email binding, which is evidently not
true.

SOAP 1.2 Part 1, section 3.3, also says "A MEP MAY be supported by one or
more underlying protocol binding instances": a MAY, not a MUST.

Ugo