code: public Set<ModuleModel> getReferencedModules() {
  		Set<ModuleModel> set = new HashSet<>();
  		set.addAll(exportedModules);
  		set.addAll(importedModules);
  		return set;
  	}
docs: Get the union of {@link #getImportedModules()} and
  {@link #getExportedModules()}