<xsd:attribute form="qualified" name="Format" use="optional" default="General">
    <xsd:annotation>
        <xsd:documentation>Specifies a number format code in the Excel number format syntax.</xsd:documentation>
    </xsd:annotation>
    <xsd:simpleType>
        <xsd:union memberTypes="xsd:string">
            <xsd:simpleType>
                <xsd:restriction base="xsd:string">
                    <xsd:enumeration value="General" />
                    <xsd:enumeration value="General Number" />
                    <xsd:enumeration value="General Date" />
                    <xsd:enumeration value="Long Date" />
                    <xsd:enumeration value="Medium Date" />
                    <xsd:enumeration value="Short Date" />
                    <xsd:enumeration value="Long Time" />
                    <xsd:enumeration value="Medium Time" />
                    <xsd:enumeration value="Short Time" />
                    <xsd:enumeration value="Currency" />
                    <xsd:enumeration value="Euro Currency" />
                    <xsd:enumeration value="Fixed" />
                    <xsd:enumeration value="Standard" />
                    <xsd:enumeration value="Percent" />
                    <xsd:enumeration value="Scientific" />
                    <xsd:enumeration value="Yes/No" />
                    <xsd:enumeration value="True/False" />
                    <xsd:enumeration value="On/Off" />
                </xsd:restriction>
            </xsd:simpleType>
        </xsd:union>
    </xsd:simpleType>
</xsd:attribute>