3.2.4.1.1 wsa:MessageID
The WS-Management specification endorses two different MessageID URI formats, as specified in [DMTF-DSP0226] section 5.4.4.
Web Services Management Protocol Extensions for Windows Vista clients SHOULD use the uuid:xxxxxxxx-xxxx--xxxx--xxxx--xxxxxxxxxxxx MessageID format. The MessageID value MUST be at least one character in length.