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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: SOAP and the Web
 Hi Paul, Paul said: > Query parameters are NOT representations of resource. Query parameters > are part of the address for resources. The representation is the thing > that you get when you do a GET or the thing that you PUT or POST. Didier replies: Let's add that there is a one to one relationship between a URL and a resource and a one to one relationship between a resource and a representation. Therefore there is a one to one relationship between a URL and a resource. Let's say also that the representation is the manifestation of a particular URL. So URL <-(1,1)->Resource <- (1,1)-> representation. => URL <- (1,1)-> representation. It is easy then to see why for people, concretely a resource is what is referred by a URL and that the resource is the outcome we get when GETting a resource. In REST, each URL is a different resource. A resource is unique. What we get by performing an HTTP GET is a representation of this resource. Therefore we can say that the representation is some sort of physical (OK, in bits and bytes or encoded with characters) incarnation of an etherized monad named a resource. People skip the etherized monad and make the direct connection Resource <---> URL (resource being - in that case - what I get with an HTTP GET). So maybe we can say to make things clear: a) The resource is an abstract entity representing something on the web. Its a metaphysical monad, an abstarct thing associated to a concrete thing: the representation. b) A resource may be identified by a URI. More particularly its location represented by a URL and its name by a URN. c) The outcome of an HTTP GET operation on a particular resource identified by a particular URI is its representation. However, a resource has not: a) several representations b) several URIs. cheers Didier PH Martin 
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