valign

<xs:simpleType name="valign">
  <xs:annotation>
    <xs:documentation>The valign type is used to indicate vertical alignment to the top, middle, bottom, or baseline of the text. Defaults are implementation-dependent.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:token">
    <xs:enumeration value="top"/>
    <xs:enumeration value="middle"/>
    <xs:enumeration value="bottom"/>
    <xs:enumeration value="baseline"/>
  </xs:restriction>
</xs:simpleType>