@Nullable
  public CompositePackagingElement<?> findCompositeChild(@NotNull String name) {
    for (PackagingElement<?> child : getChildren()) {
      if (child instanceof CompositePackagingElement && name.equals(((CompositePackagingElement<?>)child).getName())) {
        return (CompositePackagingElement)child;
      }
    }
    return null;
  }
@Nullable
  public CompositePackagingElement<?> findCompositeChild(@NotNull String name)