staff 

Staff assignment is only needed for music notated on multiple staves. Used by both notes and directions. Staff values are numbers, with 1 referring to the top-most staff in a part.

Element Information

Model

Source 

<xs:element name="staff" type="xs:positiveInteger">
  <xs:annotation>
    <xs:documentation>Staff assignment is only needed for music notated on multiple staves. Used by both notes and directions. Staff values are numbers, with 1 referring to the top-most staff in a part.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample