db:numeration.attribute

<xs:attributeGroup name="numeration.attribute">
  <xs:attribute name="numeration">
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:enumeration value="arabic"/>
        <xs:enumeration value="upperalpha"/>
        <xs:enumeration value="loweralpha"/>
        <xs:enumeration value="upperroman"/>
        <xs:enumeration value="lowerroman"/>
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
</xs:attributeGroup>