Some questions about the W3C Intelligent Personal Assistant Architecture

Some questions about the W3C Intelligent Personal Assistant Architecture

1.As I understand, Google Assistant, Alexa, Microsoft Cortana, Bixby, 
and other IPA providers reside in the blue rectangle to the right of the 
architecture picture.

2.What is the relationship between Dialog n/Intent Set n (in the orange 
box) an IPA provider n (in the blue box

3.Who do you envision will build and maintain the dialog (the orange 
rectangle)? This looks like a giant joIPA Providers supply their own 
user interface.

4. Will they allow giving up control to the client (green box) an Dialog 
(orange box) especially their own TTSs and ASRs

5.It appears to me, that the orange dialog serves two purposes (a) 
answer common questions and (b) route remaining questions to the 
appropriate IPA provider.  Do I understand this correctly.

Regards,

Jim Larson