See the full post for context and (as usual) insightful analysis
In the mind of the Googleplex, the generations of the web proceed something like this:
Web 1.0: web as extension of PC hard drive
Web 2.0: web as application platform complementing PC operating system and hard drive
Web 3.0: web as universal computing grid replacing PC operating system and hard drive
Web 4.0: web as artificial intelligence complementing human race
Web 5.0: web as artificial intelligence supplanting human race
I agree with Carr's definition:
Web 3.0 involves the disintegration of digital data and software into modular components that, through the use of simple tools, can be reintegrated into new applications or functions on the fly by either machines or people.
In my perspective, Web n+1 is thus a very powerful and flexible content management system that has more in common with DBMS++ than it does some kind of recycled AI magic. XQuery will have a pivotal role in the transformation to Web n+1.