if (!_load_font_nodes.empty ()) {
xmlpp::Element* load_font = root->add_child("LoadFont");
load_font->set_attribute("Id", _load_font_nodes.front()->id);
if (!_load_font_nodes.empty ()) {
xmlpp::Element* load_font = root->add_child("LoadFont");
load_font->set_attribute("Id", _load_font_nodes.front()->id);