<!DOCTYPE doc [
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<!ELEMENT doc (tst*)>
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<!ELEMENT tst (#PCDATA)>
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<!ATTLIST tst a NMTOKENS #IMPLIED>
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<!ATTLIST tst b CDATA #IMPLIED>
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<!ENTITY d "
">
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<!ENTITY a "
">
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<!ENTITY da "
">
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]>
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<doc>
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<tst a="
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xyz" b="
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xyz"/>
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<tst a="&d;&d;A&a; &a;B&da;" b="&d;&d;A&a; &a;B&da;"/>
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<tst a="

A

B
" b="

A

B
"/>
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<tst a=" x  y " b=" x  y "/>
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<tst a=" a b " b=" a b "/>
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<tst a=" a b " b=" a b "/>
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</doc>
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