Hi, we are implementing the JSON-RPC 2 protocol, and would like to offer an
improvement.
We have a case where a request can register a customer, set the delivery
address data, save the basket of goods selected and register an order.
A batch request seems a good approach where each action is called
sequentially, within a single HTTP request.

The problem is that we need another macro-command to manage the process of
each methods called.
The user may be registered, the address validation may fail, and the basket
is saved, then the order registration should not be executed.
If the user is not registered, all other methods should be skipped.

This is a case for a Command (action) design pattern described by GOF. We
should register a macro command object and make our methods as sub-commands
of a macro command.

What is the best way to describe the macro command in the JSON-RPC 2
protocol? It seems like there is no sub-methods described. I can simply
create the method called MACRO and place it along with other methods, and
parse it as a macro command in an application logic.

WBR, Grigori