2010/1/20 Trevor Daniels <t.daniels@xxxxxxxxxxx>:
ADD_ACKNOWLEDGER asks for your engraver to be
notified whenever the referenced grob is created.
It arranges for your acknowledge_<grobname> method
to be called when a grob with name <grob_name>
is created and passes a ref to it. See any span
engraver, eg slur-engraver.cc for the details.
Slight misconception here (which I corrected recently in the CG): It's
the grob-interface which determines which grobs are acknowledged, not
the grob name.
Regards,
Neil