<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE rnode [
<!ELEMENT rnode (f)>
<!ELEMENT f (#PCDATA)>
<!ATTLIST f att1 CDATA #FIXED "J">
<!ENTITY f "
<f>
hello world
</f>
">
]>
<rnode>
&f;
</rnode>