-/// the rule attached to the ball
-struct Stem : public Item {
- /// rhythmical length
- Moment note_length;
-
- // heads the stem encompasses (positions)
+
+/**the rule attached to the ball.
+ takes care of:
+
+ \begin{itemize}
+ \item the rule
+ \item the flag
+ \item up/down position.
+ \end{itemize}
+ */
+
+struct Stem : Item {
+ /// heads that the stem encompasses (positions)