globalTermWeights

<xs:attribute name="globalTermWeights" default="inverseDocumentFrequency">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="inverseDocumentFrequency"/>
      <xs:enumeration value="none"/>
      <xs:enumeration value="GFIDF"/>
      <xs:enumeration value="normal"/>
      <xs:enumeration value="probabilisticInverse"/>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>