1<!ENTITY % c SYSTEM "http://example.org/c/c.dtd">
2%c;
3<!ENTITY % b SYSTEM "http://example.org/b/b.dtd">
4%b;
5<!ENTITY % a SYSTEM "http://example.org/a/a.dtd">
6%a;
7<!ELEMENT cba (c, b, a)>
8