gistfile1.txt

class one {
    notify{"one": }
}

class two {
    notify{"two": }

    Notify <| |> { message => "hello" }
}

notify{"outside": }

include one, two

gistfile2.txt

% puppet apply test.pp
Notice: Compiled catalog for devco.net in environment production in 0.87 seconds
Notice: hello
Notice: /Stage[main]/Main/Notify[outside]/message: defined 'message' as 'hello'
Notice: hello
Notice: /Stage[main]/One/Notify[one]/message: defined 'message' as 'hello'
Notice: hello
Notice: /Stage[main]/Two/Notify[two]/message: defined 'message' as 'hello'
Notice: Finished catalog run in 0.03 seconds