"Spanning trees do not make sense on directed graphs");
xbt_dynar_foreach(g->nodes, cursor, node) {
"Spanning trees do not make sense on directed graphs");
xbt_dynar_foreach(g->nodes, cursor, node) {
fprintf(file, "<?xml version='1.0'?>\n");
fprintf(file, "<!DOCTYPE graph SYSTEM \"graphxml.dtd\">\n");
fprintf(file, "<?xml version='1.0'?>\n");
fprintf(file, "<!DOCTYPE graph SYSTEM \"graphxml.dtd\">\n");