+/*
+ * For bt_bool, bt_component, bt_component_class,
+ * bt_component_class_filter, bt_component_class_sink,
+ * bt_component_class_source, bt_component_filter, bt_component_sink,
+ * bt_component_source, bt_connection, bt_graph, bt_port_input,
+ * bt_port_output, bt_value
+ */