+ADD_ACKNOWLEDGER(Spacing_engraver,staff_spacing);
+ADD_ACKNOWLEDGER(Spacing_engraver,note_spacing);
+ADD_ACKNOWLEDGER(Spacing_engraver,rhythmic_head);
+
+ADD_TRANSLATOR (Spacing_engraver,
+ /* descr */ "make a SpacingSpanner and do bookkeeping of shortest starting and playing notes ",
+ /* creats*/ "SpacingSpanner",
+ /* accepts */ "",
+ /* reads */ "",
+ /* write */ "");