Reference to non-SGML character Error Message

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 22:58:28 UTC

In HTML files with the following DTD
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
certain character entities are flagged as errors. Please see the example
below:

 ... lass="bold">*M/S/C Creighton/O&#146;Keefe Moved to go into E ...
                                              ^
     Error: reference to non-SGML character 

I'm not exactly sure why that is technically invalid but I am not aware of
any browsers that have a problem with it. The problem also happens with
character entities &#148; &#150;

Also, I tried it with another DTD validator and it did not report a problem.

Richard T. Kennedy
The Boeing Company
PO Box 3999  MC 8R-03
Seattle, WA  98124-2499