I dont know of a commonly used pattern for this, all of your suggestions seem okay. Of course you don't need to parse xml and then update an element, in a lot of situations just returning an html fragment and update some element directly will suffice. In an application I developed recently, which excessively uses the ExtJs framework, I use JSON responses like Frederick suggests. (Be aware of Javascript Hijacking if you use JSON for exchanging data, though it's not neccesarily a problem when it only contains error messages.) -- Posted via http://www.ruby-forum.com/.
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