New API in libxml++ 2.24

Member xmlpp::Element::add_child_text (xmlpp::Node *previous_sibling, const Glib::ustring &content=Glibustring())

Member xmlpp::Element::add_child_text_before (xmlpp::Node *next_sibling, const Glib::ustring &content=Glibustring())

Member xmlpp::Node::add_child (xmlpp::Node *previous_sibling, const Glib::ustring &name, const Glib::ustring &ns_prefix=Glibustring())

Member xmlpp::Node::add_child_before (xmlpp::Node *next_sibling, const Glib::ustring &name, const Glib::ustring &ns_prefix=Glibustring())