Difference between REST and POX
I really can't get the difference between REST and POX web services. I mean, couldn't POX be considered as a REST web service with XML message definitions?
It depends on what your "Plain Old XML" contains.
The thing is, POX used to be compared with SOAP. SOAP is a very specific way to do XML over (mostly) HTTP and people were already doing "plain old XML" over HTTP. SOAP got a lot of criticism because it complicated the things people were already doing with POX. But I won't go into that, what I'm trying to say is that people used POX to do RPC.
REST isn't RPC. In REST, the XML is a representation of a resource, not a message definition as in RPC. There is also a very important REST constraint that people seem to forget or ignore that imposes constraints on the returned XML: the hypermedia constraint or HATEOAS.
If you want to find out more about how POX fits in REST, I recommend reading this article: Richardson Maturity Model, steps toward the glory of REST.
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