1 <?xml version='1.0'?>

     2 <!DOCTYPE test [

     3 <!ELEMENT test (#PCDATA) >

     4 <!ENTITY % xx '&#37;zz;'>

     5 <!ENTITY % zz '&#60;!ENTITY tricky "error-prone" >' >

     6 %xx;

     7 ]>

     8 <test>This sample shows a &tricky; method.</test>