2.2.1.4.2 MESSAGETYPE
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.
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<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.