Google Sitemap原来支持普通Feed

Google Sitemap原本是一种全新的xml格式，但是在Sitemap的FAQ里面却有这样一条：

   We also support the Open Archives Initiative (OAI) PRotocol for metadata harvesting,      a popular protocol in the library world. If your sitemaps are already available in OAI-PMH version 2.0 format,      you are welcome to submit these. We also accept rss 2.0 and Atom 0.3 syndication feeds, using the link/lastMod fields.

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