A really useful feature enhancement would be the ability to have the legend display filtered when you filter the layer. so if a user filters a layer by a a;ttribute selection or by an area, the legend would be filtered accordingly. if you filtered by map extent, then you could have a dynamic legend that relates to only the features in the view and in the selection. After looking at json help for arcserver, this seems do-able, I think this would be a valuable feature in essentials.
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