+struct Preinit_Engraver_group
+{
+ Drul_array<SCM> acknowledge_hash_table_drul_;
+ Preinit_Engraver_group ();
+};
+
+class Engraver_group : Preinit_Engraver_group, public Translator_group
+{
+protected:
+ vector<Announce_grob_info> announce_infos_;
+ void override (SCM);
+ void revert (SCM);
+public:
+ DECLARE_CLASSNAME (Engraver_group);