<?xml version="1.0"?>
<!DOCTYPE root [
  <!ELEMENT root (a,b)>
  <!ELEMENT a EMPTY>
  <!ELEMENT b (#PCDATA|c)* >
  <!ELEMENT c ANY>
  <!ELEMENT d ((e,e)|f)+ >
  <!ELEMENT e ANY>
  <!ELEMENT f EMPTY>
]>
<root><a/><b>
   <c></c> 
   content of b element
   <c>
      <d><e>no more children</e><e><f/></e><f/></d>
   </c>
</b></root>
<!--* test P39's syntax and Element Valid VC *-->