[Haskell-cafe] is anyone familiar with "Comprehending Queries" by Torsten Grust?

[Günther Schmidt]

Hi all,

is anyone here familiar with the paper "Comprehending Queries" by 
Thorsten Grust? 
http://kops.ub.uni-konstanz.de/volltexte/1999/312/pdf/312_1.pdf

As the paper dates from 1999 I wonder if its content may have been 
"obsoleted" by later works or if it still is pretty much current.

I ask this because I'm still struggling to put my program with lots of 
queries on a more sound code base.

Günther