<xs:simpleType name="step"><xs:annotation><xs:documentation>The step type represents a step of the diatonic scale, represented using the English letters A through G.</xs:documentation></xs:annotation><xs:restriction base="xs:string"><xs:enumeration value="A"/><xs:enumeration value="B"/><xs:enumeration value="C"/><xs:enumeration value="D"/><xs:enumeration value="E"/><xs:enumeration value="F"/><xs:enumeration value="G"/></xs:restriction></xs:simpleType>