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libxml2
1: <?xml version="1.0"?>
2: <!DOCTYPE test [
3: <!ELEMENT test (#PCDATA)>
4: <!ENTITY % xx "%zz;">
5: <!ENTITY % zz '<!ENTITY tricky "error-prone" >'>
6: <!ENTITY tricky "error-prone">
7: ]>
8: <test>This sample shows a &tricky; method.</test>