[Zope] Local or not local roles?

[Marco Lazzeri]

Hello!

I was just surfing around into ZMI  when into

http://dual:27080/some_filename/manage_listLocalRoles

i've found this:

"To give a user extra roles when accessing this object
(and ___its children___),
select a user from the User list below, select the extra roles that
should be given to that user from the Roles list."

Are not local roles setted only in that exactly context? Why it says
says "(and its children)"?

Thank you,
Marco Lazzeri