<xs:attributeGroup name="cellhalign">
    <xs:annotation>
        <xs:documentation>
      horizontal alignment attributes for cell contents

      char        alignment char, e.g. char=':'
      charoff     offset for alignment char
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name="align">
        <xs:simpleType>
            <xs:restriction base="xs:token">
                <xs:enumeration value="left" />
                <xs:enumeration value="center" />
                <xs:enumeration value="right" />
                <xs:enumeration value="justify" />
                <xs:enumeration value="char" />
            </xs:restriction>
        </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="char" type="Character" />
    <xs:attribute name="charoff" type="Length" />
</xs:attributeGroup>