code: public FacesConfigMapEntryType<FacesConfigMapEntriesType<T>> getOrCreateMapEntry()
     {
        List<Node> nodeList = childNode.get("map-entry");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new FacesConfigMapEntryTypeImpl<FacesConfigMapEntriesType<T>>(this, "map-entry", childNode, nodeList.get(0));
        }
        return createMapEntry();
     }
docs: If not already created, a new <code>map-entry</code> element will be created and returned.
  Otherwise, the first existing <code>map-entry</code> element will be returned.
  @return the instance defined for the element <code>map-entry</code>