[NTG-context] DTD's and XML-ConTeXt question

23 May 2018

      Here is a sample xml-document:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE namen SYSTEM “setup/xmp.dtd" [
	<!ENTITY example “This is an example">
]>
<root>&example;&xmpl;</root>

The file setup/xmp.dtd contains the line:
<!ENTITY xmpl "This is an example from a DTD file”>

My 1st question, why does this fail for &xmpl;? The &example; is substituted but &xmpl; is not. 

My 2nd question is why included files do not substitute either of these two entities. 
Thus in: <root>xml-document-included</root> processed by \xmlprocessfile{}{included-file}{}</root>
nor &example; nor &xmpl; is substituted.

So, what am I doing wrong here?

Hans van der Meer