2015-07-15 UTC
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csarven One simplification is that the target URL doesn't make the last call. As I understand it, source URL makes the call on the target URL. At the time of submitting the webmention, the target URL is only a "temporary" remark about the relation, nothing more. There is a claim, but it is not verified. The "owner" of the source URL makes the claim and fosters verification.