NEW ISSUE: Clarify the rules on which queues are used for responses andcallbacks

Target: JMS binding

Description: The JMS binding spec currently doesn't say how the response
and callback element definitions relate to messages that are sent from
a reference, and those sent by a service, and what the precedence of the
message's replyTo and scaCallbackQueue are relative to the SCDL definitions.

Proposal:

Messages sent from a JMS reference with
a response queue have the JMS replyTo queue set to the response queue name.

For messages received by a service,
by default the replyTo, if present, overrides any defined response element.

If scaCallbackQueue is present in a
message, the callback binding destination is ignored.

Clarify that in the callback/conversation
section that the use of replyTo and service callback queue are there for
interacting with non-SCA applications

Possible additional updates that relate
to these: 

Add "overrideReplyTo={true|false}"
attribute to the <response> element for a service indicating always
use vs. only use if no replyTo specified in a given received message -
false is the default).  

Add "overrideCallbackQueue="{true|false}"
attribute to <binding.jms>, which applies when the binding is used
on a service callback, to indicate whether the service callback queue is
always used or only when no replyTo and scaCallbackQueue in a received
request message.

Add "useForCallback="{true|false}"
attribute to the <response> element for a reference that inficates
that callbacks should go to the replyTo queue without having to duplicate
the definition in a callback service binding.

Simon Holdsworth

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