after-change-function nil

Aleksander Buczynski writes:
 > hello,
 > 
 > maybe that's something obvious, but after changing to emacs 21.1.1
 > I get this message everytime I try to parse DTD:
 > 
 > sgml-setup-doctype: Symbol's value as variable is void: after-change-function
 > 
 > any hints?

Hi,

after-change-function has been an obsolete variable in Emacs for
some releases. It was replaced by after-change-functions. 
Apparently Emacs 21 now no longer defines the obsolete version.
A quick look at the psgml sources seems to indicate that it
is aware that after-change-function is obsolete. So a quick
fix (which I haven't tested) would be to put the following
in your .emacs file

(setq after-change-function nil)

I am in the process of updating the XAE  so I will include
some such fix in the next release.

- Paul

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