I guess this would mean "Open Worldcat"-translator in the end. But there are sometimes errors (another edition/version) which seems in all my test better with the webservice. Moreover, it is possible to ask for really recent (e.g. not yet published) titles. E.g. http://xisbn.worldcat.org/webservices/xid/isbn/0-345-66666-6?method=hyphen&format=xml . Because the publisher group is still 345 the webservice guess that the publication place will also be "New York". What do you think?