code: public List<UniqueConstraint<CollectionTable<T>>> getAllUniqueConstraint()
     {
        List<UniqueConstraint<CollectionTable<T>>> list = new ArrayList<UniqueConstraint<CollectionTable<T>>>();
        List<Node> nodeList = childNode.get("unique-constraint");
        for(Node node: nodeList)
        {
           UniqueConstraint<CollectionTable<T>>  type = new UniqueConstraintImpl<CollectionTable<T>>(this, "unique-constraint", childNode, node);
           list.add(type);
        }
        return list;
     }
docs: Returns all <code>unique-constraint</code> elements
  @return list of <code>unique-constraint</code>