<xs:simpleType name="start-note"><xs:annotation><xs:documentation>The start-note type describes the starting note of trills and mordents for playback, relative to the current note.</xs:documentation></xs:annotation><xs:restriction base="xs:token"><xs:enumeration value="upper"/><xs:enumeration value="main"/><xs:enumeration value="below"/></xs:restriction></xs:simpleType>