int introspect_write_default_interfaces(struct introspect *i, bool object_manager);
int introspect_write_child_nodes(struct introspect *i, Set *s, const char *prefix);
int introspect_write_default_interfaces(struct introspect *i, bool object_manager);
int introspect_write_child_nodes(struct introspect *i, Set *s, const char *prefix);