🚀 go-pugleaf

PC>The NIH class library book (published in the U.K.) didn't have a hyphen
PC>between the publisher and book number, much to my surprise.

NEL>The hyphens isn't significant. The system is designed so the
NEL>interpretation is unique. This means that you always know what parts of
NEL>the ISBN is the language number and the publishers number.
NEL>Ie. since Denmark has the number 87, there can be no language number 8
NEL>or with the prefix 87.

	Actually, it is necessary that the hyphen is arbitrary, as big
publishers need shorter numbers to allow room for their larger (and hence
longer) book numbers in the fixed 10 digit sequence.


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