<xs:attribute name="vertalignment" default="top" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="top" />
      <xs:enumeration value="center" />
      <xs:enumeration value="baseline" />
      <xs:enumeration value="bottom" />
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>