Specifying HD/SD thumbnails in MRSS

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I don’t understand how to specify multiple thumbnails (HD and SD) for a single in my MRSS feed. I’m using <media:thumbnail url=“xxxx.jpg” /> to call one thumbnail for each ; what’s the syntax to call multiple, thumbnails (one HD, the other SD) for a single ?

I’m using Roku’s MRSS template; I’m aware of that snippet (below) in NWM_MRSS.brs calls the thumbnails from the MRSS feed, but I don’t understand how to specify “newItem.sdPosterURL” and “newItem.hdPosterURL” in my MRSS file.


' thumbnail
   tmp = item.GetNamedElements("media:thumbnail")
   if tmp.Count() > 0
	newItem.sdPosterURL = ValidStr(tmp[0]@url)
	newItem.hdPosterURL = ValidStr(tmp[0]@url)
   else if item.GetNamedElements("media:group").Count() > 0
	tmp = item.GetNamedElements("media:group")[0].GetNamedElements("media:thumbnail")
	if tmp.Count() > 0
          newItem.sdPosterURL = ValidStr(tmp[0]@url)
          newItem.hdPosterURL = ValidStr(tmp[0]@url)
        end if
   else if xml.channel.image.url.Count() > 0
	newItem.sdPosterURL = ValidStr(xml.channel.image.url.GetText())
	newItem.hdPosterURL = ValidStr(xml.channel.image.url.GetText())
   end if

I’m sure this is a beginner’s question; thanks for the help.