<xs:simpleType name="staff-type">
  <xs:annotation>
    <xs:documentation>The staff-type value can be ossia, cue, editorial, regular, or alternate. An alternate staff indicates one that shares the same musical data as the prior staff, but displayed differently (e.g., treble and bass clef, standard notation and tab).</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="ossia"/>
    <xs:enumeration value="cue"/>
    <xs:enumeration value="editorial"/>
    <xs:enumeration value="regular"/>
    <xs:enumeration value="alternate"/>
  </xs:restriction>
</xs:simpleType>