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Transfer
The basic operations required to manage the data entities accessed through Web services are defined in WS-Transfer. An understanding of WS-Transfer requires two new terms to be introduced: resource and factory. A resource is any entity addressable by an endpoint reference that can provide its XML representation. A factory is a Web service that can create a resource from its XML representation. WS-Transfer introduces operations that create, update, retrieve, and delete resources. It should be noted that the state maintenance for a resource is, at most, subject to the "best efforts" of the hosting server. When a client receives the server's acceptance of a request to create or update a resource, it can reasonably expect that the resource now exists at the confirmed location and with the confirmed representation, but this is not a guarantee, even in the absence of any third parties. The server might change the representation of a resource, might remove a resource entirely, or might bring back a resource that was deleted. This lack of guarantees is consistent with the loosely coupled model brought by the Web. If desired, services can offer additional guarantees that are not required by the Web services architecture.WS-Transfer's create, update, and delete operations extend the capabilities of the read-only operations found in WS-MetadataExchange. The retrieve operation is exactly the same Get operation in WS-MetadataExchange. The Create request is sent to a factory. The factory then creates the requested resource and determines its initial representation. The factory is assumed to be distinct from the resource being created. The new resource is assigned a service-determined endpoint reference, which is returned in the response message.The Put operation updates a resource by providing a replacement representation. A one-time snapshot of the representation of a resource, identical to the Get operation in WS-Metadata-Exchange, can be retrieved by using the Get operation in WS-Transfer. After a successful Delete operation, the resource is no longer available through the endpoint reference. These four metadata management operations form the basis needed to build state management in Web services.
