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2.2.1.4.2 MESSAGETYPE

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The MESSAGETYPE enumeration is used in Windows Media Digital Rights Management (WMDRM): MTP Command Extension messages to determine if a message contains a challenge, or response message. A challenge message is a request for information required to fulfill a process and a response message is sent as a reply to a challenge message.

 <xs:simpleType name="MESSAGETYPE">
   <xs:restriction base="xs:string">
     <xs:enumeration value="challenge"/>
     <xs:enumeration value="response"/>
   </xs:restriction>
 </xs:simpleType>

challenge: A request for information.

response: A reply to a request for information.