ibm50i01.xml

<?xml version="1.0"?>
<!DOCTYPE root SYSTEM "ibm50i01.dtd" [
  <!ELEMENT root (a,b)>
]>
<root><a/><b>
   <c></c >
   content of b element
</b></root>
<!--* a invalid test: tests VC:Proper Group/PE Nesting in P50 *-->