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<!DOCTYPE
book
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[ <!ELEMENT book (title, subtitle?,
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author+,
info) >
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<!ATTLIST book id
CDATA #REQUIRED >
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<!ELEMENT title PCDATA >
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<!ELEMENT subtitle PCDATA >
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<!ELEMENT author PCDATA >
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<!ELEMENT info (key*, isbn)
>
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<!ELEMENT key PCDATA >
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<!ELEMENT
isbn PCDATA >
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]>
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