test/errors/rec_att_default.xml - third_party/github.com/GNOME/libxml2 - Git at Google

 <!DOCTYPE doc SYSTEM "N" [
   <!ENTITY a "&b;">
   <!ATTLIST x y CDATA "&a;">
   <!ENTITY b "&a;">
 ]>
 <doc attr="&a;"/>
	<!DOCTYPE doc SYSTEM "N" [
	<!ENTITY a "&b;">
	<!ATTLIST x y CDATA "&a;">
	<!ENTITY b "&a;">
	]>
	<doc attr="&a;"/>