Correct terminology to use for Newsfeed

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I have been reading a lot about setup different newsfeeds and different type
of language they use and sometimes it is misleading especially when they
place that graphic icon like xlm, rss etc. on the side. The way I see it is
a file that has programing codes that can be written as a rss, atom, xlm,
php and many more language and what ever language if I use a xlm then I
should show the xlm gif so other users that it is a xlm file.Is that

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