PATH Mac OS 8 and 9 Developer Documentation > Text Encoding Conversion Manager
Programming With the Text Encoding Conversion Manager

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Character Encodings Masquerading as Related Encodings

Some Internet names used for similar character encodings could lead to confusion. For example, the Windows Latin-1 character encoding is commonly labeled ISO-8859-1 on the Internet because it is a superset of ISO 8859-1. Clients that actually treat it as ISO 8859-1 may be confused by the extra characters in the C1 area.

The Mac OS Roman character set used for Western European languages was created several years before ISO 8859-1. It does not have exactly the same repertoire, and many of the characters it does share with ISO 8859-1 have different code points. Many Mac OS Internet applications use an encoding developed by André Pirard in which the Mac OS Roman repertoire is assigned new code points to align as much as possible with ISO 8859-1; this character encoding is referred to as Mac Latin-1 or Mac Mail and is usually labeled as ISO-8859-1 on the Internet.