REST - not a Standard
REST is not a standard. You will not see the W3 putting out a REST specification. You will not see IBM or Microsoft or Sun selling a REST developer's toolkit. Why? Because REST is just an architectural style. You can't bottle up that style. You can only understand it, and design your Web services in that style.
While REST is not a standard, it does prescribe the use of standards:
- XML/HTML/GIF/JPEG/etc (Resource Representations)
- text/xml, text/html, image/gif, image/jpeg, etc (Resource Types, MIME Types)