<?xml version="1.0" encoding="utf-8" ?>
  <!--* PEs are properly nested *-->
  <!ELEMENT a (#PCDATA)* >
  <!ELEMENT b (#PCDATA) >
  <!ELEMENT c ( #PCDATA)*>

  <!ENTITY % mixed0 "(#PCDATA|c)*" >
  <!ENTITY % mixed1 "%mixed0;">
  <!ELEMENT d %mixed1; >
  
  <!ENTITY % mixed1.5 "c| b" > 
  <!ELEMENT e (#PCDATA| %mixed1.5; |a)* >

  <!ELEMENT f (#PCDATA| c)* >
  <!ELEMENT g ( #PCDATA) >
  <!ELEMENT h (#PCDATA )>

  <!ENTITY % mixed2 "( #PCDATA )">
  <!ELEMENT i %mixed2; >