algorithm

<xs:attribute name="algorithm" default="exclusiveRecommendation">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="recommendation"/>
      <xs:enumeration value="exclusiveRecommendation"/>
      <xs:enumeration value="ruleAssociation"/>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>