cgicc: multi-levels of same element
<ul>
  <li>
    <a href="#" ><span>Main 1</span></a>
    <ul>
      <li><a href="ref1-1" ><span>Sub 1</span></a></li>
      <li><a href="ref1-2" ><span>Sub 2</span></a></li>
      <li><a href="ref1-3" ><span>Sub 3</span></a></li>
    </ul>
  </li>
  <li>
    <a href="#" ><span>Main 2</span></a>
    <ul>
      <li><a href="ref2-1" ><span>Sub 1</span></a></li>
      <li><a href="ref2-2" ><span>Sub 2</span></a></li>
      <li><a href="ref2-3" ><span>Sub 3</span></a></li>
    </ul>
  </li>
</ul>

cout << ul() << endl;
  cout << li() << endl;
    cout << a("Main 1").set("href", "#") << endl;
    cout << ul() << endl; // <-- must fail here!
      cout << li(a("Sub 1").set("href", "ref1-1")) << endl;
      cout << li(a("Sub 2").set("href", "ref1-2")) << endl;
      cout << li(a("Sub 3").set("href", "ref1-3")) << endl;
    cout << ul() << endl;
  cout << li() << endl;
  cout << li() << endl;
    cout << a("Main 2").set("href", "#") << endl;
    cout << ul() << endl;
      cout << li(a("Sub 1").set("href", "ref2-1")) << endl;
      cout << li(a("Sub 2").set("href", "ref2-2")) << endl;
      cout << li(a("Sub 3").set("href", "ref2-3")) << endl;
    cout << ul() << endl;
  cout << li() << endl;
cout << ul() << endl;

#include <cgicc/HTMLElement.h>
#include <cgicc/HTMLAttributeList.h>

template<class Tag>
class HTMLSimpleElement : public cgicc::HTMLElement
{
public:
  HTMLSimpleElement() : HTMLElement(0, 0, 0, EElementType(-1))
  {}

  HTMLSimpleElement(const cgicc::HTMLAttributeList& attributes) : HTMLElement(&attributes, 0, 0, EElementType(-1))
  {}

  virtual ~HTMLSimpleElement() {}

  virtual inline HTMLElement* clone() const
  { return new HTMLSimpleElement<Tag>(*this); }

  virtual inline const char* getName() const
  { return Tag::getName(); }

  virtual void render(std::ostream& out) const
  {
    const cgicc::HTMLAttributeList* attributes = getAttributes();

    out << '<' << getName();

    if (attributes != NULL)
    {
      out << ' ';
      attributes->render(out);
    }

    out << ">";
  }
};

#define TAG(name, tag)
class name##Tag
{ public: inline static const char* getName() { return tag; } }

#define SIMPLE_ELEMENT(name, tag)
TAG(name, tag); typedef HTMLSimpleElement<name##Tag> name

SIMPLE_ELEMENT (divB, "div");
SIMPLE_ELEMENT (divE, "/div");

// and so on...