Using the .NET System.ServiceModel.Syndication classes...

I would like to add a new SyndicationElementExtension to a SyndicationItem that will export the following XML:

<media:thumbnail url="http://www.foo.com/keyframe.jpg" width="75" height="50" time="12:05:01.123" />

Something along the lines of:

syndicationItem.ElementExtensions.Add(new SyndicationElementExtension("thumbnail", "http://video.search.yahoo.com/mrss", ?

How do you create a simple SyndicationElementExtension with a few attributes?

c# .net syndication syndication-feed atom-feed
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