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How does SOA fit in with REST?

How does SOA fit in with REST?
It doesn't, really. In one important sense, they're in direct opposition, as the distinguishing feature of SOA is that services expose service-specific interfaces, whereas the distinguishing feature of REST is that services expose generic interfaces.

The W3C Web Services Architecture working group has stated that REST is an instance of an SOA, where the interfaces happen to be GET, PUT, POST, etc... While technically accurate, this isn't a very useful characterization for the purposes of comparing SOA and REST in my opinion, because it disregards the value of the properties induced by the additional constraints of REST.
This was first published in September 2003

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