Suggestion: Change the text in Section 5.1.1 https://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.4.html#rfc.section.5.1.1 to say "The topic URL MUST be the one advertised by the publisher during the discovery phase."
Section 5.1.1 currently says "The topic URL MUST be the one advertised by the publisher in a Self Link Header during the discovery phase."
However, section 4 says that the topic URL can be specified in *either* the Link header or a tag in the document body, such as an HTML link tag. This change makes the sections consistent.
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