Does SOA Require Registry-Based Dynamic Discovery?

What is the TC's 
opinion on the answer to the question of "does SOA require registry-based 
dynamic discovery"? I know that Discovery is a pattern in the .047 spec, which 
leads me to believe that the position is that SOA does not *require* 
registry-based discovery.

 

For example, suppose 
that:

 

- 2 organizations 
are using Web Services in a "SOA-like" manner (meaning shared services 
represented as Web Services, that are invoked by other Web Services). 

 

- There is no 
registry-based dynamic discovery, perhaps because the organizations agree that 
these service locations are completely (or relatively) stable, and that if the 
locations change, there will be some out-of-band mechanism for propagating 
updated WSDL documents

 

Are these 2 
organizations therefore *not* using a service-oriented architecture? That is, 
does the second point completely negate the first? Or, is it all really a matter 
of business and technical requirements?

 

Kind Regards,

Joseph Chiusano

Booz Allen Hamilton

Strategy and Technology Consultants to 
the World