interest

<xs:attribute name="interest" default="buy">
  <xs:simpleType>
    <xs:restriction base="xs:NMTOKEN">
      <xs:enumeration value="buy"/>
      <xs:enumeration value="sell"/>
      <xs:enumeration value="lease"/>
      <xs:enumeration value="trade-in"/>
      <xs:enumeration value="test-drive"/>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>