Dear Mr. Guo,
This I-D is a good idea. It is the first time I hear about the idea of IDOCA (Interconnection and Interoperability of Cloud-Office Application) with the html file format. If this idea comes true, it will be beneficial to all cloud-office user. However, the problem of security will arise with the interconnection and the interoperability, but the solution for it is not specific in this I-D. Maybe deeper discusses need to be made.
Kun