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[Valid Atom 1.0] This is a valid Atom 1.0 feed.
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This feed is valid, but interoperability with the widest range of feed readers could be improved by implementing the following recommendations.
line 1, column 0: Missing atom:link with rel="self" [help]
<feed xmlns="http://www.w3.org/2005/Atom">
line 17, column 3: summary should not contain HTML unless declared in the type attribute: b [help]
]]></summary></entry></feed>
   ^
Source: