UPCs, EANs, and ISBNs

A blog post by jrochkind clamied that he has figured out the relations among UPCs, EANs, and ISBNs. He said that EAN=0+UPC; ISBN-13=EAN; 978, 979 are bookland prefixes. Sound interesting? After reading the post and responses, you may still confusing. Yeah, Sometimes industries tend to choose more complicated ways to organize information not otherwise...