However, not every data region is used for data extraction; some of them are employed to restrict the scope of other regions to certain portions of the page.
Data region is a label for a thing in the software, I want to say the purpose of all of them is not the same thing. How can I say such sentences, for another example
Not all of them ? are designated ? to do something, some of them are supposed to do it...
I have two problem, one is that I don't know the structure to except somethings from a task, and second is that I don't know a good synonym for "designated "