1<!DOCTYPE doc [
2<!ELEMENT doc (src | dest)*>
3<!ELEMENT src EMPTY>
4<!ELEMENT dest EMPTY>
5<!ATTLIST src ref IDREF #IMPLIED>
6<!ATTLIST dest id ID #IMPLIED>
7<!ENTITY dest "<dest id='foo'/>">
8]>
9<doc>
10 <src ref="foo"/>
11 &dest;
12 <src ref="foo"/>
13</doc>
14
15