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System: Windows NT ITPWINWEBSVR22 10.0 build 20348 (Windows Server 2022) AMD64
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$ pwd: D:/Python311/Lib/test/xmltestdata/c14n-20/
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File: D:/Python311/Lib/test/xmltestdata/c14n-20/inC14N5.xml
<!DOCTYPE doc [
<!ATTLIST doc attrExtEnt CDATA #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) -->
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