should engravers be pluralized (note_heads_engraver) or not
(note_head_engraver) ?
+@item
+should we allow numbers in identifier names? Issue:
+http://code.google.com/p/lilypond/issues/detail?id=1670
+
+@item
+should we officially allow accented characters? in general, how
+do we feel about utf-8 stuff?
+
+@item
+for the sake of completeness/simplicity, what about *disallowing*
+the "one-note" form of a music expression? i.e. only allowing
+stuff like
+@verbatim
+ \transpose c d { e1 }
+ \transpose c d << e1 >>
+@end verbatim
+
+and never allowing
+@verbatim
+ \transpose c d e1
+@end verbatim
+
@end itemize