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22.6.6 Byte Order Mark

The Unicode Byte Order Mark (BOM) is treated as whitespace in the default readtable. This allows the Lisp reader to read a Unicode (UCS-2 encoded, external-format :unicode ) file regardless of whether the BOM is present.

Some editors including Microsoft Notepad and the LispWorks editor write the BOM when writing a file with Unicode (UCS-2) encoding.


LispWorks User Guide and Reference Manual - 21 Dec 2011

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