@Override
  public @Nullable PsiElement getDocumentationElementForLink(PsiManager mgr, String string, PsiElement psiElement) {
    final String[] strings = string.split("\\$");
    if (strings.length == 2) {
      return new DocElement(mgr, psiElement, strings[0], strings[1]);
    }
    return null;
  }
@Override
  public @Nullable PsiElement getDocumentationElementForLink(PsiManager mgr, String string, PsiElement psiElement)