Please see attached review. I am the assigned Gen-ART reviewer for this draft. For background on Gen-ART, please see the FAQ at < http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>. Please wait for direction from your document shepherd or AD before posting a new version of the draft. Document: draft-ohye-canonical-link-relation-04.txt Reviewer: Brian Carpenter Review Date: 2011-12-14 IETF LC End Date: 2011-12-29 IESG Telechat date: 2012-01-05 Summary: Almost ready (LC comments not addressed) -------- Minor issue: ------------ > 1. Introduction > > The canonical link relation specifies the preferred URI from a set of > URIs that return identical or vastly similar content, ... I don't understand the phrase "vastly similar". I don't understand what algorithm tests for vast similarity. The same applies to "extremely similar" in section 3 and "similar to" in section 5. Also, "similar to" is weaker than "vastly similar" or "extremely similar"; so does section 5 intend to weaken the earlier text? It seems that exactly the same phrase should be used in each case (not just a vastly similar phrase). This doesn't matter so much when it's a human designating the canonical relation. But it can only be a matter of time before code starts to do this (which page is canonical among a set of generated pages?). A vague word like "similar" turns this into an AI problem.