[1] Uniform Messaging Policy, Level One ( 版) <http://www.w3.org/TR/2010/WD-UMP-20100126/>
[2] Uniform Messaging Policy, Level One ( 版) <http://www.w3.org/TR/2014/NOTE-UMP-20141002/>
Work on this document has been discontinued and it should not be referenced or used as a basis for implementation.
[3] Uniform Messaging Policy, Level One ( 版) <http://dev.w3.org/2006/waf/UMP/>