TDG_XML_TOPO_DIGRAPH
if (xmlStrcmp(root->name, (xmlChar *)TDG_XML_TOPO_DIGRAPH) != 0 ||
"failed to parse %s element", TDG_XML_TOPO_DIGRAPH);
TDG_XML_TOPO_DIGRAPH, TDG_XML_SCHEME, tdg->tdg_scheme,
(void) fprintf(fp, "</%s>\n", TDG_XML_TOPO_DIGRAPH);