@Override
  public void registerFixes(@NotNull URLReference ref, @NotNull QuickFixActionRegistrar registrar) {
    registrar.register(new FetchExtResourceAction());
    registrar.register(new ManuallySetupExtResourceAction());
    registrar.register(new IgnoreExtResourceAction());

    final PsiElement parentElement = ref.getElement().getParent();
    if (parentElement instanceof XmlAttribute && ((XmlAttribute)parentElement).isNamespaceDeclaration()) {
      registrar.register(new AddXsiSchemaLocationForExtResourceAction());
    }
  }
@Override
  public void registerFixes(@NotNull URLReference ref, @NotNull QuickFixActionRegistrar registrar)