Pending Update

["Liu, Hong" <Hong.Liu@neustar.biz>]

The current update operation defined in EPP is basically a two step process:
First, an update request is made by the registrar to the registry. Second,
the registry either rejects the request or performs the operation; and a
response is sent back to the registrar.

A pending update refers to a four step process: First, an update request is
made by the registrar to the registry. Second, the registry acknowledges the
request to the registrar but does not take action for the moment, i.e., the
update is pending. Third, upon further authorization, the registry either
rejects the request or performs the operation; then posts the result to the
message queue. Fourth, the registrar polls the message queue to retrieve the
result of the operation.

Conceptually, pending update is very similar to the transfer operation
currently defined in EPP.

I would like to hear from the list how such operation is supported by EPP.
If this topic has been discussed before on the mailing list, I would
appreciate pointers to the previous discussions.