In the programmersguide ( 3.01 rev b) its says in chapter 2.6:
"Note that this tutorial uses the Query system in the most elementary way. To read more about attributes, queries and system design, please refer to section 0."
Where is the section 0 ??
I would like learn more about possiblities for the Query-objects. Fx. how do I do a distinct search all topics where I want to group by Users?