1 <?xml version="1.0" standalone="no"?>
   2 <!DOCTYPE main [
   3 <!ELEMENT main (table)*>
   4 <!ELEMENT table (column)*>
   5 <!ATTLIST table name NMTOKEN #REQUIRED>
   6 <!ELEMENT column ANY>
   7 <!ATTLIST column name NMTOKEN #REQUIRED>
   8 <!ATTLIST column expr CDATA #REQUIRED>
   9 <!ENTITY mkm "mkrishnamohan">
  10 <!ENTITY ee SYSTEM "ee.xml">
  11 ]>
  12 
  13 <main>
  14 &ee;
  15 </main>