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The extension has nothing to do with representation in HTTP. It's the content type (in the headers). 

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On Oct 12, 2011, at 17:15, Bryan Taylor <btaylor at rackspace.com> wrote:

> On 10/11/2011 10:28 AM, George Reese wrote:
>> It's wildly inappropriate to equate a thing with its representation.
> 
> Unless the thing is itself a representation, yes. A resource can be ANYTHING: a server, a database record about a server, a car, a rock, the concept of love, the act of smiling, or a representation of a second resource, etc...
> 
> http://example.com/thing is the thing
> http://example.com/v1/thing is the set of v1 representation of the thing
> http://example.com/v2/thing is the set of v2 representation of the thing
> http://example.com/v1/thing.json is the v1 JSON representation of the thing
> http://example.com/v2/thing.xml is the v2 XML representation of the thing
> 
> A resource that represents a representation or set of representations of second resource is called a variant resource of the other.
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> 
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