<!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) –>