test/warning/ent9 - third_party/libxml2 - Git at Google

 <?xml version="1.0"?>
 <!DOCTYPE EXAMPLE SYSTEM "example.dtd" [
 <!ENTITY xml "<prefix:node>prefix is indeclared here</prefix:node>">
 ]>
 <EXAMPLE xmlns:prefix="http://example.com">
     &xml;
 </EXAMPLE>
	<?xml version="1.0"?>
	<!DOCTYPE EXAMPLE SYSTEM "example.dtd" [
	<!ENTITY xml "<prefix:node>prefix is indeclared here</prefix:node>">
	]>
	<EXAMPLE xmlns:prefix="http://example.com">
	&xml;
	</EXAMPLE>