<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE books [
   <!ENTITY globaldefinitions SYSTEM "entity.xml">
]>
<books>
   &globaldefinitions;
   <book name="the lord of rings">
       <author name="tolkien"/>
   </book>
   <book name="le malade imaginaire">
       <author name="moliere"/>
   </book>
</books>