typename BoxMLBuilderMap::const_iterator m = boxmlMap.find(el.get_localName()); if (m != boxmlMap.end()) return (this->*(m->second))(el); else return createBoxMLDummyElement();
if (el) {  typename BoxMLBuilderMap::const_iterator m = boxmlMap.find(el.get_localName()); if (m != boxmlMap.end()) return (this->*(m->second))(el); } return createBoxMLDummyElement();
  getBoxMLElement(const typename Model::Node& el) const  {    //std::cerr << "createBoxMLElement " << el.get_localName() << std::endl;    typename BoxMLBuilderMap::const_iterator m = boxmlMap.find(el.get_localName());    if (m != boxmlMap.end())      return (this->*(m->second))(el);    else      return createBoxMLDummyElement();  }