[geezerjay]

> How does "REST" handle coordinated transaction rollback/compensation over multiple heterogenous service calls?

By "REST" I assume you're referring to non-SOA distributed systems which might happen to use REST or RPC-over-HTTP interfaces, and not the architecture style.

Assuming that, "REST" handles all those features by integrating services that support coordinated transaction rollback/compensation over multiple heterogenous service calls.

> How is SOAP, XML, WS-*, AMQP proprietary?

If you read what I said you'll notice that I explicitly said "quasi-proprietary protocols and tooling".

[tannhaeuser]

I fail to see how your post answers anything.