@Nullable
  public PsiElement getMarkerElement() {
    final PsiElement child = getFirstChild();
    if (child != null && MarkdownTokenTypeSets.LIST_MARKERS.contains(child.getNode().getElementType())) {
      return child;
    }
    else {
      return null;
    }
  }
@Nullable
  public PsiElement getMarkerElement()