I would like to create a feed based on atom feed(http://atomenabled.org/).

1)if I want to create an xml file based on few feeds , for example I do search and I find articles in 5 different feeds and I want to output them to the user as an atom feed xml file how would I do that.

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you will probably need an additional layer of programming like php or asp. This way, use php or asp to search all the feeds for content, organize the results, and return an atom feed with the specific results.