There are several listed on the Atom wiki http://www.intertwingly.net/wiki/pie/FrontPage
Look at RFC's 4685, 4946 and 5005 There are a few other experimental, in-progress I-D's but they're not really in active use as far as I know. Non-standard extensions include OpenSearch, Microsoft's Simple Sharing Extensions and GData's family of extensions. Also, any of the RSS extensions are typically fine for use with Atom: http://rss-extensions.org/wiki/Main_Page I haven't seen very many of those actually being used with Atom feeds, however. Those that I have seen used with Atom include GeoRSS, Dublin Core, Yahoo Media, and Creative Commons (which should be replaced by RFC 4946). - James MURATA Makoto (FAMILY Given) wrote: > Tim and James, > > Thanks for encouraging comments. > > Folks, > > Does somebody have a list of know extensions to atom? If such a > list is available, I am happy to improve the schema. I am inclined > to maintain the NVDL+RNG version only, since that version is much > easier to maintain. > > I tested the NVDL script using oXygen. Its NVDL engine is publicly > available at: > > http://www.oxygenxml.com/onvdl.html > > Cheers,
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