<!doctype gdoc [
  <!element gdoc           - - (#PCDATA)>
  <!entity intent1 SYSTEM "intent1.gml">
  <!entity intent2 SYSTEM "intent2.gml">
  <!entity e1 "e1 text">
  <!entity e2 "e2 text">
  <!entity e3 "e3 contains the &e1 and the &e2 and &intent1 as well">
] -- end of gdoc dtd -->
<gdoc>
A reference to the &e1 and the &e2;.
The entity &e3 is done.
</gdoc>
