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<?xml version="1.0"?> |
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<!DOCTYPE doc [ |
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<!ELEMENT doc ((a | b)+ , c , d)*> |
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<!ELEMENT a (#PCDATA)> |
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<!ELEMENT b (#PCDATA)> |
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<!ELEMENT c (#PCDATA)> |
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<!ELEMENT d (#PCDATA)> |
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]> |
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<doc><b>This</b><c> is a</c><d> valid document</d></doc>
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