<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE marvel [
  <!ELEMENT marvel (superheroe*)>
  <!ELEMENT superheroe (#PCDATA)>
  <!ENTITY marvel "Ediciones Marvel">
]>
<marvel>
  <superheroe>Thor el de &marvel;</superheroe>
  <superheroe>Hulk</superheroe>
  <superheroe>Iron Man</superheroe>
</marvel>