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<!DOCTYPE doc [ <!ATTLIST doc attrExtEnt ENTITY #IMPLIED> <!ENTITY ent1 "Hello"> <!ENTITY ent2 SYSTEM "world.txt"> <!ENTITY entExt SYSTEM "earth.gif" NDATA gif> <!NOTATION gif SYSTEM "viewgif.exe"> ]> <doc attrExtEnt="entExt"> &ent1;, &ent2;! </doc> <!-- Let world.txt contain "world" (excluding the quotes) -->