In chapter:

In chapter:

    7.7. Keys

you have

    However, my application requires that each collection will also have a
    unique name. Why? So that a human being who wants to modify a collection
    will be able to identify it. It's much harder to know, if you have two
    collections named "Life Science", the the one tagged 24433 is the one
you
    need, and the one tagged 29882 is not

    I think 'the the' shouldn't be repeated twice. Although taken from an
email it would be cool to fix.

Cheers,
Maxim Maletsky