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about meta character and character coding .


From: waterloo
Subject: about meta character and character coding .
Date: Thu, 6 Aug 2009 14:57:20 +0800

I can not understand the following para in Emacs Lisp Reference :

In a string, the 2**7 bit attached to an ASCII character indicates a
meta character; thus, the meta characters that can fit in a string have
codes in the range from 128 to 255, and are the meta versions of the
ordinary ASCII characters.  (In Emacs versions 18 and older, this
convention was used for characters outside of strings as well.)

One bit has two states.
Does 2**7 bit denote 7 bits ?

What does `thus, the meta characters that can fit in a string have
codes in the range from 128 to 255, and are the meta versions of the
ordinary ASCII characters. ' mean ?

Thanks

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