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<?xml version="1.0"?>
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<!DOCTYPE doc [
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<!ELEMENT doc (src | dest)*>
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<!ELEMENT src EMPTY>
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<!ELEMENT dest EMPTY>
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<!ATTLIST src ref IDREF #IMPLIED>
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<!ATTLIST dest id ID #IMPLIED>
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<!ENTITY dest "<dest id='foo'/>">
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]>
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<doc>
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<src ref="foo"/>
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&dest;
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<src ref="foo"/>
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</doc>
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