Hi,

my customer asked me to write a DTD and a XXE configuration for his XML files. 
Some of them may at random contain a namespace declaration at their root 
element - which of course is of little use with a DTD, and in fact does not 
convey any information within the XML structure concerned, so it may be ignored.

My trouble with XXE at this point is that, when starting up, it occasionally 
shows this warning dialog box saying (translated from German):

Document type warning: file /mypath/my.dtd::: Missing namespace binding 
"<!ATTLIST root xmlns:myns CDATA #IMPLIED>"

The DTD in my.dtd, of course, needs to simulate the namespace declaration as an 
attribute, since the XML files may contain it, and I am not allowed to change 
them.

My XXE configuration properly declares that (pseudo-) namespace, so it should 
be fine for that matter.

The warning dialog box shows up in a quite idiosyncratic manner, so it is 
rather hard to reproduce. But it is still very annoying, especially for someone 
(like my customer) who is easily frightened by such a warning.

How can I make sure that this warning never appears again?

   Yves
 
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