W3C document types research

Hi,

 I am research assistant at department of information science in University
of Osijek, Croatia. With my college I am doing research on web sites in
Croatia domain (.hr). Research questions are: Is index page of web site
declared to some document type and if so is it valid?; What share is taking
upcoming html5 standard.

I literature overview we came up to this article that is directly link to
what we are doing

http://www.computer.org/portal/web/csdl/doi/10.1109/MIC.2008.37



My question for you: Do you have any papers or survey results to this
subject?



Tanks fo your time, greetengs from Osijek, Croatia!

-- 
Tomislav Jakopec, asistent
               FFOS