WS Questions...

I've posted a couple questions out at:
http://groups.yahoo.com/group/service-orientated-architecture/

Here's a condensed version, with some additions:
1. Should a WSDL be produced for the ultimate sender? If so, should it be stored in the registry? If not, why not?

2. If "Contract First" is considered a best practice, should it applied to ultimate senders in addition to ultimate receivers?

3. Should a WSDL editor create two WSDL's at once (one being the invocation document advertised by the sender, the other being a service-side WSDL)?

4. Imagine that you have two WSDL's: one representing the ultimate sender, the other representing the ultimate receiver. The outbound interface on WSDL #1 matches the inbound interface on WSDL #2 (an operation signature match). Should the 'component-service' composition environment visually enable a 'snap together' programming model?

5. Let's call the thing that components and services snap into the "SCB", a variation of the PCB (printed circuit board). Should the SCB dictate the flow-of-control in a proxy like fashion (like bpel)? Should the SCB act as a message router focusing on endpoint resolution?

These are important questions. As one WS-Luminary told me, "composition is the killer app". Can I be any more blunt? ;-)


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Definitions
Ultimate Sender = the caller, the consumer, the client, etc.
Ultimate Reciever = the service, the producer, the recipient of the call, etc.
Contract First = the practice of stubbing out functional interfaces and non-functional policies prior to writing the implementation.