+void
+Engraver_group_engraver::initialize ()
+{
+ /*
+ docme: why bool_f.
+
+ */
+ SCM tab = scm_make_vector (gh_int2scm (61), SCM_BOOL_F);
+ set_property ("acknowledgeHashTable", tab);
+
+ Translator_group::initialize ();
+}
+
+Engraver_group_engraver::Engraver_group_engraver() {}
+
+ENTER_DESCRIPTION(Engraver_group_engraver,
+/* descr */ "A group of engravers taken together",
+/* creats*/ "",
+/* accepts */ "",
+/* acks */ "",
+/* reads */ "",
+/* write */ "");
+
+
+
+/*****************/
+
+
+bool engraver_valid (Translator*tr, SCM ifaces)
+{
+ SCM ack_ifs = scm_assoc (ly_symbol2scm ("interfaces-acked"), tr->translator_description());
+ ack_ifs = gh_cdr (ack_ifs);
+ for (SCM s = ifaces; ly_pair_p (s); s = ly_cdr (s))
+ if (scm_memq (ly_car (s), ack_ifs) != SCM_BOOL_F)
+ return true;
+ return false;
+}
+
+
+
+SCM
+find_acknowledge_engravers (SCM gravlist, SCM meta_alist)
+{
+ SCM ifaces = gh_cdr (scm_assoc (ly_symbol2scm ("interfaces"), meta_alist));
+
+ SCM l = SCM_EOL;
+ for (SCM s = gravlist; ly_pair_p (s); s = ly_cdr (s))
+ {
+ Translator* tr = unsmob_translator (ly_car (s));
+ if (engraver_valid (tr, ifaces))
+ l = scm_cons (tr->self_scm (), l);
+ }
+ l = scm_reverse_x (l, SCM_EOL);
+
+ return l;
+}