Just review some articles about RESTFUL stuff, my understanding is RESTFUL is another more general version of OOP concept.
more readings, enjoy!
http://rest.elkstein.org/2008/02/what-is-rest.html
http://www.ruanyifeng.com/blog/2011/09/restful.html
http://www.c-sharpcorner.com/UploadFile/dacca2/understand-wcf-part-2-understand-restful-service/
http://en.wikipedia.org/wiki/Representational_state_transfer