What is advantage of DODP?

I am new about DODP and i have 2 questions related to it:
1. how many organization implement online library based on DODP?
2. I've just read about OPDS (Open Publishcation Distributed System) but I don't know what is the advantage of DODP than OPDS?

Can anyone give me some ideas?

Thank you very much.

I suggest that you read the article DAISY Online Delivery: Providing Access to Information in Effective Way. Also, use cases listed at the DAISY Online Delivery project page provide a glimpse into the implementations of the DAISY Online Delivery Protocol.


Thank you very much for your link. I will read it more detail.