Google PageRank: Does it count per domain or per webpage

Is the Google PageRank calculated as one value for a whole website (domain) or is it computed for every single webpage?

Solution

How much Google follows publicly known PageRank algorithm is their trade secret. In generic algorithm page rank is calculated per document.

Edit: original, generic PageRank explained http://www.ams.org/featurecolumn/archive/pagerank.html

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