2 <!ATTLIST doc attrExtEnt ENTITY #IMPLIED>
4 <!ENTITY ent2 SYSTEM "world.txt">
5 <!ENTITY entExt SYSTEM "earth.gif" NDATA gif>
6 <!NOTATION gif SYSTEM "viewgif.exe">
8 <doc attrExtEnt="entExt">
12 <!-- Let world.txt contain "world" (excluding the quotes) -->