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Someone recently on this list was saying something about ways to embed facets in for instance Atom feeds. I was reminded of that, because checking out an Atom feed from Google Books Data API, in Internet Explorer... Internet Explorer displays 'facet' type restrictions for it, under a heading "Filter by category". It also displays sort options, apparently somehow the feed is advertising it's sort options too in a way that a client like IE can act upon? Haven't looked into the details, but here's an example feed: http://books.google.com/books/feeds/volumes?q=LCCN07037314 Look at it in IE for instance. So whatever's being done here is apparently already somewhat standard, at least IE recognizes what Google does? I'd encourage SRU or whoever to follow their lead. [I agree that simply copying the Solr API for a standard like SRU is not the way to go -- Solr is an application that supports various low-level things that are not appropriate in that level of detail for a standard like SRU or what have you, at least not until they've been shown to be needed.]