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Hi Martin,
You write:
 It's not a bug in toxml, which should always serialize the
 DOM tree if possible.
Right! In this case it is *not* possible. The generated serialization is
not a well formed XML document.
Having just consulted the DOM technical reports, I see that
createComment is specified as not generating any exceptions, so although
it would be quite a sensible place to check that one was not creating an
insane document, probably one should not do the check there. I think
you're right that this *is* a bug in DOM, and I will report it there.
Having said that, I still think that toxml should throw an exception. In
general, if toxml succeeds, I would expect to be able to parse the result.
I can propose a doco change, but I think such would only be a partial
solution. Something like the following addition to the description for
createComment
Note that comments containing the string C{-->} may make the document
unserializable.
cheers,
Tom