code: public TldDeferredValueType<TldAttributeType<T>> getOrCreateDeferredValue()
     {
        Node node = childNode.getOrCreate("deferred-value");
        TldDeferredValueType<TldAttributeType<T>> deferredValue = new TldDeferredValueTypeImpl<TldAttributeType<T>>(this, "deferred-value", childNode, node);
        return deferredValue;
     }
docs: If not already created, a new <code>deferred-value</code> element with the given value will be created.
  Otherwise, the existing <code>deferred-value</code> element will be returned.
  @return  a new or existing instance of <code>TldDeferredValueType<TldAttributeType<T>></code>