Duration
http://www.w3.org/TR/2010/WD-mediaont-10-20100608/duration
is a Property

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Outgoing links
Property Object
Type Property
By http://www.w3.org/TR/2010/WD-mediaont-10-20100608/
See also http://www.w3.org/TR/2010/WD-mediaont-10-20100608/