Nested using

General Usage
1

I see codes like

using pkg1 
using pkg1.mod1
using pkg1.mod1:   fun1, fun2

Why is a single ‘using pkg1’ not enough?

2

Consider package A that looks like this:

module A
    export f_A

    f_A() = 1

    module B
        export f_B

        f_B() = 2
        g_B() = 3
   end
end

Then:

using A
f_A() # returns 1
f_B() # not defined
g_B() # not defined

A.B.g_B() # returns 2
A.B.g_B() # returns 3

using A.B
f_B() # returns 2
g_B() # not defined

B.g_B() # returns 3

using A.B: g_B
g_B() # returns 3
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