How to import submodules

So I want to write a package for Querying Astronomy data and I want to make extensive use of submodules to seperate different queryable services. An example is in the following code:

module AstronomyQuery
    module Simbad

        export query_identifier

        function query_identifier(identifier::String)

            println("Nothing Implemented")

            return identifier



Now I seem to be too dumb to actualy figure out how to import that function. For example in my tests folder. Can anyone help me how to import the submodule correctly?

using AstronomyQuery.Simbad: query_identifier

(or just using AstronomyQuery.Simbad since the function is exported).