<?xml version='1.0'?>
<!DOCTYPE test [
<!ELEMENT test (#PCDATA) >
<!ENTITY % xx '&#37;zz;'>
<!ENTITY % zz '&#60;!ENTITY tricky "error-prone" >' >
%xx;
]>
<test>This sample shows a &tricky; method.</test>
<!-- Example 2 from XML spec 1.0 Appendix D -->