type

<xs:attribute name="type">
  <xs:simpleType>
    <xs:restriction base="xs:NMTOKEN">
      <xs:enumeration value="e-notation"/>
      <xs:enumeration value="integer"/>
      <xs:enumeration value="rational"/>
      <xs:enumeration value="real"/>
      <xs:enumeration value="complex-cartesian"/>
      <xs:enumeration value="complex-polar"/>
      <xs:enumeration value="constant"/>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>