<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;S-expression" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;S-expression</a> and <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Xupl" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Xupl</a> are available and have many language bindings