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       <xs:enumeration value="fail"/>
       <xs:enumeration value="policy"/>
       <xs:enumeration value="neutral"/>
       <xs:enumeration value="temperror"/>
       <xs:enumeration value="permerror"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:complexType name="DKIMAuthResultType">
     <xs:all>
       <!-- The "d=" parameter in the signature. -->
       <xs:element name="domain" type="xs:string"
                   minOccurs="1"/>
       <!-- The "s=" parameter in the signature. -->
       <xs:element name="selector" type="xs:string"
                   minOccurs="0"/>
       <!-- The DKIM verification result. -->
       <xs:element name="result" type="DKIMResultType"
                   minOccurs="1"/>
       <!-- Any extra information (e.g., from
            Authentication-Results). -->
       <xs:element name="human_result" type="xs:string"
                   minOccurs="0"/>
     </xs:all>
   </xs:complexType>

   <!-- SPF domain scope. -->
   <xs:simpleType name="SPFDomainScope">
     <xs:restriction base="xs:string">
       <xs:enumeration value="helo"/>
       <xs:enumeration value="mfrom"/>
     </xs:restriction>
   </xs:simpleType>

   <!-- SPF result. -->
   <xs:simpleType name="SPFResultType">
     <xs:restriction base="xs:string">
       <xs:enumeration value="none"/>
       <xs:enumeration value="neutral"/>
       <xs:enumeration value="pass"/>
       <xs:enumeration value="fail"/>
       <xs:enumeration value="softfail"/>
       <!-- "TempError" commonly implemented as "unknown". -->
       <xs:enumeration value="temperror"/>
       <!-- "PermError" commonly implemented as "error". -->
       <xs:enumeration value="permerror"/>
     </xs:restriction>
   </xs:simpleType>

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