I agree that it’s not easy to understand and there’s a lot of concept behind this. Basically, the dependancy tree should let you create kind of “intensity” link between words.
For example, if you analyze “Bubble is nice” Bubble may be considered as the “Root” word and a lot of thing will be linked to it.
Bubble will be dependant of itself (index 1), is will be dependant of Bubble too (index 1 too) and nice will be dependant of Bubble too (index 1 too).
Yes. Most of the time this will be a verb (I said that the ROOT item was Bubble but the root item is “IS”. But in this case, all words (what GNL call “token” are related to index 1 (IS). I just test it to see and this is what it give to me. So this is how you can get a “tree” (like a kind of mind mapping?)