+int gl_instance_get_all (graph_inst_callback_t callback, void *user_data);
+
+int gl_search (const char *search, graph_inst_callback_t callback,
+ void *user_data);
+
+int gl_search_field (graph_ident_field_t field, const char *field_value,
+ graph_inst_callback_t callback, void *user_data);
+