foreign element description issue (non-XML?)

In reviewing DITA 1.2, I came across something that is more
than just editorial, so I thought I'd take it to the list.

The shortdesc for the foreign element says (excerpted):

 The <foreign> element allows content.... The content may be XML
 or non-XML, such as MathML, SVG, or some non-XML data format....

I don't believe "non-XML" is correct.  I don't see how one
can put non-XML inside an XML document.  In fact, I don't
know what is meant by "non-XML" in this case.

My review comment is suggesting we delete any reference
to non-XML in this description.  Any objections?

paul