bug#7172: emacs 23.2; xml.el: xml-parse-file hangs when DOCTYPE element names contain _ (underscore)

[Chong Yidong]

Jose Marino <marinoj@astro.ufl.edu> writes:

> In a DOCTYPE construction, whenever there's an ELEMENT name with an
> underscore in its name, function xml-parse-file makes emacs become
> unresponsive and use 100% cpu. Emacs recovers nicely with C-g but no
> error is printed.
>
> $ cat example-bad.xml
> <?xml version="1.0" encoding="utf-8"?>
> <!DOCTYPE EXAMPLE [
>    <!ELEMENT EXAM_PLE EMPTY>
> ]>
> <EXAM_PLE>
> </EXAM_PLE>

This is fixed in trunk.  Thanks for the bug report.