code: public List<VariableType<TagType<T>>> getAllVariable()
     {
        List<VariableType<TagType<T>>> list = new ArrayList<VariableType<TagType<T>>>();
        List<Node> nodeList = childNode.get("variable");
        for(Node node: nodeList)
        {
           VariableType<TagType<T>>  type = new VariableTypeImpl<TagType<T>>(this, "variable", childNode, node);
           list.add(type);
        }
        return list;
     }
docs: Returns all <code>variable</code> elements
  @return list of <code>variable</code>