+ --
+ -- Before we actually run the import, we check it against a list
+ -- of problem DTDs. These can produce weird errors, and we have
+ -- checks for them. But with DTD validation enabled, we can't
+ -- even look inside the document to see what's wrong -- parsing
+ -- will fail! So for those special document types, we proceed
+ -- using 'parse_opts_novalidate' instead of the default
+ -- 'parse_opts'.
+ --