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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) -->