<xs:element name="col">
    <xs:annotation>
        <xs:documentation>
      col elements define the alignment properties for cells in
      one or more columns.

      The width attribute specifies the width of the columns, e.g.

          width=64        width in screen pixels
          width=0.5*      relative width of 0.5

      The span attribute causes the attributes of one
      col element to apply to more than one column.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:attributeGroup ref="attrs" />
        <xs:attribute name="span" default="1" type="Number" />
        <xs:attribute name="width" type="MultiLength" />
        <xs:attributeGroup ref="cellhalign" />
        <xs:attributeGroup ref="cellvalign" />
    </xs:complexType>
</xs:element>