| http://www.w3.org/ns/prov#value | - Because being an Authority page and being ranked at some keywords are a bit different.A page can be a PR6, it can not rank at blue widgets because many of its backlinks are not related with blue widgets but this PR6 page is simply tought as an authority page and if it links to a like PR4 blue widget page then PR6 page makes PR4 page ranked better then itself for the keyword blue widgets.
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