Those snippets you are asking about right now, are those handled by the “external” system.
My first thought was that it could be Excel or something similar, but I never heard of one that allows to have qualified names.
So if you really need an explanation about how that piece of code works, ask the person who has written it. If (s)he can’t explain, get him/her fired… OK, thats a bit harsh 
Just take him/her to the next forum that has this language as topic and ask again there.
But be aware of the fact, that those guys in the other forum will need some additional context as well. There are a lots of names used as values (I suppose), and they might ask where those values come from.