Cross-staff beams example

[notator]

(This proposal first appeared in Pull Request #208, which is now closed. I've taken @bhamblok's advice here, and removed the id attribute from the quarter-note on the top staff.)

---

I'd like to add an MNX by Example for cross-staff beams on a grand staff.
@adrianholovaty If you agree, and you think this example is okay, maybe you could post the MusicXML code here. I could then update MNX by Example...
(This example adapted from #198 (comment))

<mnx>
    <global>
        <measure/>
    </global>
    <part> <!-- a part on a grand staff having two staves -->
       <measure>
           <sequence staff="1">  /*** default staff number for this voice */
               <directions>
                   <clef sign="G" line="2"/>
               </directions>
               <event value="/4" >
                   <note pitch="C5"/>
               </event>
           </sequence>
           <sequence staff="2">  /*** default staff number for this voice  */
                <directions>
                   <clef sign="F" line="4"/>
                </directions>
                <event value="/16" id="event1">
                    <note pitch="Ab3"/>
                </event>
                <event value="/16" id="event2">
                   <note pitch="C4"/>
                </event>
                <event value="/16" staff="1" id="event3">  /*** override this voice's default staff number*/
                   <note pitch="F4"/>
                </event>
                <event value="/16" staff="1" id="event4">  /*** override this voice's default staff number*/
                   <note pitch="E4"/>
                </event>
                <beams>
                    <beam events="event1 event2 event3 event4" >
                          <beam events="event1 event2 event3 event4"" />
                    </beam>
                </beams>
           </sequence>
       </measure>
   </part>
</mnx>

[notator]

This issue has been superseded by #219.