I don't understand your comment. Here is an example for this webservice:
http://xisbn.worldcat.org/webservices/xid/isbn/0345534832?method=hyphen&format=xml
The result is the ISBN with the hyphens in the correct places and some information about the "groups in the ISBN": for example 0-345-53483-2 -> 0 = English speaking countries, 345 = publisher. Do you mean the area code? Another example is area code 3, which includes besides Germany also Austria and Switzerland.