AFGXMLRequestOperation is an extension for AFNetworking that creates fully instantiated GDataXMLDocument instances instead of NSXMLParsers.
[apiClient registerHTTPOperationClass:[AFGXMLRequestOperation class]];
[apiClient getPath:@"path/" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"response xml doc %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"uh oh");
}];