<?xml version="1.0" encoding="UTF-8">
| <foo>
|   "
    "
|   <!--  def='NT-Char' -->
|   <!--  -->
|   "Char* ']]>' "
|   <nt>
|     def="NT-Char"
|     "Char"
|   "*))
']]>'
"
|   <com>
|     "CDATA sections"
|   "
"
|   <rhs>
|     "| '<!DOCTYPE'
("
|     <nt>
|       def="NT-Char"
|       "Char"
|     " - ('[' | ']'))+
('['
"
|     <nt>
|       def="NT-simpleDTD"
|       "simpleDTD"
|     "*
']')? '>'"
|   "
"
|   <com>
|     "doc type declaration"
|   "
"
|   <prod>
|     id="NT-simpleDTD"
|     <lhs>
|       "simpleDTD"
|     "
"
|     <rhs>
|       "'<!&como;'
("
|       <nt>
|         def="NT-Char"
|         "Char"
|       "* -
("
|       <nt>
|         def="NT-Char"
|         "Char"
|       "* '&comc;' "
|       <nt>
|         def="NT-Char"
|         "Char"
|       "*))
'&comc;>'"
|     "-->
"
