<?xml version="1.0"?>
<!DOCTYPE elt0 [

  <!ELEMENT elt0 (elt1+)>
  <!ATTLIST elt0 base CDATA #IMPLIED>

  <!ENTITY logo SYSTEM "logo.png" NDATA PNG>
  <!NOTATION PNG SYSTEM "image/png">

  <!ELEMENT elt1 (#PCDATA)>
  <!ATTLIST elt1 source ENTITY #REQUIRED>

  <!ENTITY ref PUBLIC "-//X-Hive//native xml storage//EN" "test5.xml">
]>
   <elt0 base="base">
      <elt1 source="logo">first elt1</elt1>
      &ref;
   </elt0>
