Why do we do this to ourselves. As my friend Keys said, we go through endless cycles as an industry solving the same problems again and again. Technology X is too complex, create technology Y cause it is much simpler. Then technology Y lacks features, so lets add it. Now technology Y is too complex, let's create technology Z, and so forth. I have gone through distributed technologies like ONC RPC, COM, CORBA, EJB, Web Services, SCA. I am a fan of REST, because it exploited existing HTTP infrastructure.
So, why the rant, cause I see people doing exactly what destroys simple technologies. Most recent is this link TX support for JAXRS and REST and transactions. Adding transactional support for JAXRS? Why would I want distributed transactions for REST. Really, don't we learn anything in this industry. Why on earth would we want to propagate transactions over REST? We already did that with SOAP? Or why would I want to expose a Tx API over multiple HTTP calls? Leaving Tx's open across multiple HTTP calls has already proven to be a bad practice? REST is stateless, and therefore makes middleware scalable.
A Business process or facade itself can be a resource (/MyBusinessProcess), but the implementation of that service can use regular Tx API's and hide those details.
REST is about "Exploitation." Web Services and SCA is about "Abstraction" Let's put a stake in the ground and use the right technologies for the job rather than destroy something as beautiful as REST.