Re: ISN patch that applies cleanly with git apply

hi peter,

> I would like to hear what people think of my observations about the
> design of contrib/isn. In particular, I'd like Jan Otto to contribute
> - he probably has more domain knowledge than I do. I haven't heard
> from Jan about the proposed regression test.
> 
> In producing this patch, did you work off the listing of all the
> 628,000 assigned publisher codes that is only available in book form
> at a cost of €558? How might I verify the correctness of the new
> ISBN_range, preferably without spending €558?    :-)

no, i used only the official information from international isbn agency to produce this patch. 

Range Message (XML) from http://www.isbn-international.org/page/ranges

we have much more information (payed) about publishers and its prefixes internally, but for
hyphenation we dont need more information as provided in the above xml-file.

additionally i put in support for the 979-prefix, because new ranges get applied to this new
prefix. as far as i know old ranges will never change.

regards, jan