OK, you look for something different than I understood.
The CLASS REFERENCE to DocBook seems to be not directly available as in Studio.
Just by external access to Documentation ....
Part of it is found if you have an class in your editor and move your cursor over a class name
then you get a volatile class description that you can nail down by clicking or <F2>
Its's pretty similar to the DocBook version EXCEPT that you have no further references (e.g. Data Types or %Status or ...)
So it's not a multi level navigation like in browser!
For illustration I have done this for %Persitent. For %Populate, %XML.Adaptor you have do again and again.