code: public List<ConstraintType<ParameterType<T>>> getAllConstraint()
     {
        List<ConstraintType<ParameterType<T>>> list = new ArrayList<ConstraintType<ParameterType<T>>>();
        List<Node> nodeList = childNode.get("constraint");
        for(Node node: nodeList)
        {
           ConstraintType<ParameterType<T>>  type = new ConstraintTypeImpl<ParameterType<T>>(this, "constraint", childNode, node);
           list.add(type);
        }
        return list;
     }
docs: Returns all <code>constraint</code> elements
  @return list of <code>constraint</code>