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