Pass PFPS4 comments

Dear all,

I made a pass over the PFPS4 comments [1].  I wrote my personal comments
in square brackets.
I could not answer all comments, and the implementation of several of
the comments is up to the editors of the BLD documents.


Best, Jos

[1] http://www.w3.org/2005/rules/wiki/Response_to_PPS4
-- 
Jos de Bruijn            debruijn@inf.unibz.it
+390471016224         http://www.debruijn.net/
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