How to work with .collection files and scripting documentation

Hello guys I have 2 questions about adobe bridge.

The first one is there is a way to make smart collection with 2 distinct folders?

I opened the .collection file and  in the <collection> there is the "target" variable.

I tried to merge some paths or using two <collection> to try to get images from both folders, but it was in vain. 

So I tried searching about this <collection> class to see if I could find some other variables inside this, but didn't find anything abou it.

This goes to my second question, there is any Bridge documentation? I found Photoshop, Illustrator and other adobe programs documentation but not about Bridge.

There is a way to work with a collection with multiple files? 

There is a way to script some 3th party application for this, and if it is possible where can I find the documentation?