code: public Convert<ElementCollection<T>> getOrCreateMapKeyConvert()
     {
        List<Node> nodeList = childNode.get("map-key-convert");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new ConvertImpl<ElementCollection<T>>(this, "map-key-convert", childNode, nodeList.get(0));
        }
        return createMapKeyConvert();
     }
docs: If not already created, a new <code>map-key-convert</code> element will be created and returned.
  Otherwise, the first existing <code>map-key-convert</code> element will be returned.
  @return the instance defined for the element <code>map-key-convert</code>