laravel odd notation in includes like this: @include('flash::message')

i am using http://ift.tt/1PVkaRY and am basically 8/10 happy with it. What I saw using it:

they access things via this notation:

@include('flash::message')

or:

@include('core-templates::common.errors')

why?

and what is an easy way to find the resolution of the reference?

via Chebli Mohamed